As the festival wound down, (Y/n) found Eri waiting with Mirio. Her tiny arms bounced with excitement as she recounted her impressions of the concert. (Y/n)'s chest tightened, his emotions spilling into a joyful grin.

But (Y/n) had one more surprise. Kneeling to her level, he pulled out a red candy apple and a small, painted snowball keychain necklace. "For you, my little snowball," he said, voice cracking slightly. Her eyes widened, filling with unshed tears as she clutched the gifts.

Eri:Thank you, Papa!

Eri squealed, burying herself in his chest. In that moment, nothing else mattered—not the challenges of being a high schooler, a hero-in-training, or even the existential dread of being trapped in a wish-gone-wrong. All that mattered was her smile.

But any warm and fuzzy moment wasn't meant to last.

Right then,Yagyu appeared, arms crossed, her face a mixture of relief and irritation. She roughly grabbed (Y/n) by the collar and began dragging him away, muttering about his reckless behavior and tendency to make her worry.

Yagyu:You. Me. Talk.NOW!

she hissed, her protective streak taking full control.

As (Y/n) stumbled behind her, grinning sheepishly, his thoughts briefly turned back to the night he had gazed upon that shooting star.

Being a hero-in-training wasn't exactly what (Y/n) envisioned when he wished to "be big."

The classes were grueling, the high-pressure responsibilities suffocating, and dealing with complicated teenage relationships was something no four-year-old mind should ever have to endure. All he wanted now was to go back to being a carefree toddler.

But how? Could shooting stars reverse wishes, too?but As (Y/n) prepared to face Yagyu,he actually felt a rush of resolve—a sense of belonging.

The simplicity he longed for might never return, but the richness of life as a young man, filled with friendships and moments that matter, made the journey worthwhile. And maybe, just maybe, being a hero was not about his wish but about the people who had become his family along the way.

we see (Y/n) as he stares off into space before he turns around and looks at the 4th wall as the title appears in the sky made of stars..

'BIG'

Mada toke kirezu ni nokotta

we switch to the class as they all train and relax for their next battle as we see (Y/n) having his Kurosubasutā as he holds two cards but who's on them isn't shown as eri hugs his leg.

Hikage no yuki mitai na
Omoi wo daite ikiteru

he smiled at eri as she suddenly changed into his Original self before returning to Normal.

Nee, boku wa kono koi  wo
Donna kotoba de  tojitara ii no

Issei was in His Balance Breaker carrying random supplies as Koneko carried some stuff as well.

Anata no subete ga  ashita wo nakushite

Eien no naka wo samayotte iru yo
Sayonara dekizu ni tachidomatta mama no
Boku to issho ni

It shows the Class practicing Music for something as Jiro suddenly ran through with a guitar case.

Mada tokenai mahou no youna
Soretomo noroi no youna
Omoi nimotsu wo kakaeteru
Nee, boku wa kono machi de
Donna ashita wo sagaseba ii no
Ah-ah

Many members of The class are shown making a Candy Apple using their Metahuman abilities before it Bonks (Y/n) on his head as he caught it and smiled before giving it to Eri.

Anata no subete ga katachi wo nakushite mo
Eien ni boku no naka de ikiteku yo
Sayonara dekizu ni aruki dasu boku to
Zutto issho ni

the Class all smile as Eri stood in the center being Held By (Y/n) & Yagyu as it zoomed in on her before she smiled at the 4th wall.

__________________________________________________________________________________________________________

The story kicks into high gear on a rare "day off." Kurosu World Academy usually buzzed with action, but all the teachers, including the headmaster, had been called to an important meeting. For once, the school grounds were peaceful, leaving the students from both Class 1A and Class 1B to their own devices.

That relative calm was soon interrupted when a mysterious box the size of a small building arrived, wheeled onto the grounds and parked in front of the Class 1A dorm. Naturally, it drew the attention of students from both classes, including the ever-skeptical Neito Monoma.

While the others ogled the sheer size of the crate, (Y/N) and their bubbly partner-in-chaos, Hibari took immediate action.

(Y/n):Hibari, our package is here!

(Y/n) exclaimed, his excitement childlike as always. Hibari, equally eager, responded in her usual quirky way, pretending to use glasses of water as binoculars before confirming..

Hibari:It's the mail truck!"

Their eccentric behavior didn't go unnoticed. Monoma, one of the more sarcastic students from Class 1B, couldn't resist commenting.

Monoma:didn't realize it was Happy Hopping Moron Day...

he quipped as the mailman delivered a massive, building-sized box to (Y/n) and Hibari.

Monoma:That's a big box...

Monoma said, suspicious of what the two oddballs were up to.

As (Y/n) and Hibari pried the box open, they unveiled... a big-screen TV! But instead of marveling at the brand-new device like everyone expected, they immediately tossed it aside onto a nearby trash can.

Monoma:What are they doing? That's a new TV!

Monoma gawked, flabbergasted.

To his horror, (Y/n) and Hibari climbed into the now-empty box and closed the flaps behind them, giggling and chattering inside.

Monoma:Just when I thought,When 1A couldn't get Stupider......

Perplexed and borderline offended by their odd behavior, Monoma marched up to them.

Monoma:So....Let me get this straight—you two ordered a giant-screen television just to play in the Box?

(Y/n):Pretty smart, huh?

(Y/n) quipped, popping his head out mischievously. Hibari followed suit, her grin just as wide.

Hibari:I thought it wouldn't work

Monoma exploded.

Monoma:That is the most idiotic thing I've ever heard in my entire life! WHAT IS WRONG WITH YOU TWO?!

But (Y/n), unbothered as always, made a rainbow-shaped arc over his head with his hands and declared..

(Y/n):Monoma, we don't need television. Not as long as we have our...

He paused, adding a touch of flair.

(Y/n):...imagination!

(Y/n), attempting to navigate this strange reality, responded with a theatrical flourish of his hands.

(Y/n):I can be anything I want! A pirate!

he mimicked with a curled finger.

(Y/n):A football player!

he continued with a playful stance.

Nearby, Hibari, another student, interrupted with a hint of admiration.

Hibari:A shinobi!

Monoma, unable to resist the joke, quipped.

Monoma:If I remember, you're already a shinobi.

Hibari joined in, mimicking the rainbow as Monoma shook his head furiously, fully ready to remove himself from their idiocy.

Monoma:Fine!

he declared, stomping away before pausing for the tiniest second. 

Monoma:...Can I keep the TV?

(Y/n):Sure!

(Y/n) replied nonchalantly, sinking back into his mental box adventure.

With devious delight, the pair began their "expedition" inside the box. To the astonishment—or stupefaction—of the students gathered around, sounds of snow crunching, wind howling, and a roaring avalanche echoed from the seemingly inert cardboard.

Monoma grumbled as he pushed the massive TV to his dorm room, but not before pausing to observe the duo interacting with the box. Sounds of intense action—avalanches, helicopters, and imaginary victory bells—echoed loudly from inside.

Monoma:No way they're actually using their imaginations.

he whispered to himself, creeping closer.

Inside the box, (Y/n) and Hibari were fully committed to their "Mountain Climbing Adventure." Hibari's overacting added spice to the scene.

(Y/n):Gloves?

He Asked

Hibari:Check!

Hibari replied.

(Y/n):Hats?

Hibari:Check!

(Y/n):Undies?

Hibari:Uh....

the sound of someone pulling their pants was heard before a snap happened

Hibari:Check!

(Y/n):Okay Hibari, climb up there and secure this rope!

the toddler teen ordered as when you get to secure a rope when playing mountain climbing.

Hibari:got it!

Hibari said as the sound of her moving up a mountain to secure a rope could be heard.

What followed was a chaotic flurry of wild pretend scenarios. In their minds, the box transformed into everything from a pirate ship traversing stormy seas to a steep mountain requiring daring climbers.

Inside the box, the adventures continued.

(Y/n):Look out, Hibari! An avalanche!

(Y/n) cried dramatically.

Hibari:Whoo!

Hibari yelled back, shaking the box enthusiastically.

Hibari:I'm conquering these mountains! I'm shaking hands with GOD!

(Y/n):Hold on, Hibari!

(Y/n) shouted from inside the box, his voice barely muffled by the cardboard walls.

(Y/n):The mountain's too steep! You need to secure the rope!

Hibari:I'll never let go, (Y/n)!

Hibari replied valiantly, scuttling up an imaginary cliff, her pigtails bouncing haphazardly.

But the two simply climbed back inside the box, completely unbothered. Soon the box was filled with loud shouts of adventure.

(Y/n):Watch out for the avalanche!

(Y/n) yelled.

(Y/n):We need to make it to Base Camp before the storm hits!

Hibari:Hold on, I'm slipping!

Hibari screamed with pretend terror.

The loud ruckus caught the attention of the other students, now leaning in closer. Monoma kicked the box in irritation.

Monoma:Would you two idiots cut it—

Suddenly, a roaring sound burst forth from the box—an avalanche! Gasps echoed from the crowd as (Y/n) and Hibari cried out in fear and pain, seemingly consumed by snow and ice inside the cardboard box.

(Y/n):WE'RE FROZEN!

(Y/n) wailed dramatically.

Hibari:(Y/n),M-my legs! I can't feel them!W-what do we do?I'M SCARED!

Hibari choked out, her sobs echoing As they sounded eerily REAL.

(Y/n):We have no choice...we have to.....Cut them off!

(Y/n) responded, as though it were an actual survival scenario.

Monoma instantly paled as Yagyu from Class 1-A rushed forward in concern. She flung the box open, only to find (Y/n) and Hibari completely fine, eating snacks and giggling to themselves.

but more importantly(To her),(Y/n) and Hibari were just sitting there, perfectly fine.

Monoma:What's going on in here?!

Monoma demanded.

(Y/n):Nothing..

(Y/n) said.

Hibari:Yeah,we were just using our imagination!

Monoma's frustration boiled over.

Monoma:You idiots! There has to be some kind of device making these sounds. There's NO way this is just imagination!

He sighs and walks away believing they just being idiots before the sound of a Freaking Helicopter caught him Off guard but.....There was No Copter in sight,So How?!

??:ATTENTION CLIMBERS, PLEASE HOLD ON! THE SAWS ARE ON THE WAY

said a male pilot voice as (Y/n) and hibari began to cheer once more meaning it came from the Box!

Monoma growls and was the person to open the box this time as he yelled.

Monoma:A-HA!

but just like last time Hibari and (Y/n) were just sitting where they were the last time they open the box not appearing to have moved an inch, Nothing to make Those realistic Sounds.

Monoma:How are you DOING that?!

he demanded, ripping the box open, only to find the duo sitting calmly inside.

Monoma:The noises!

clarified Monoma as he glared as he wanted to know the answer.

Monoma:How are you two making those noises?

Hibari:that's easy,all you need is a box.

Hibari answered as she and (Y/n) showed up in the Box.

(Y/n):And imagination...!

(Y/n) said as he once again created a rainbow out of nowhere.

Monoma:Are you guys trying to say that we have No Imagination!

said Monoma as he felt offended.

Yang:Yeah we totally have imagination!

Yang said in her defense,despite disliking Monoma.

Despite his disbelief, Kaminari from Class 1-A cheerfully hopped into the box, declaring.

Kaminari:Sounds like fun! Can I join you guys?

Both (Y/n) and Hibari cheered as he joined their "mission."

Nora:Yeah I definitely have imagination, so move over I'm coming in!

Nora said as she got in the box with (Y/n),Kaminari and hibari.

Hibari:Yay!Two more members for team imagination!

she said happy that Nora and Kaminari were on board.

His suspicions grew as others also showed their doubts.

Blake:I happened to have more imagination in one hand than you two have in your entire body bodies.

Blake added as she figured that since she likes reading so much she has plenty of imagination.

Hibari:That's good now all you need is a box.

Hibari said as she and team imagination close the box once more so they could play.

Monoma:I'll show them!

the 1B Ego master said as he and everyone else left the roof to go get a box.

Sun:Hey,um....did you hear an avalanche right now?!

asked Sun as he had Neptune ran towards the group.

Neptune:Yeah! We were minding our own business when we suddenly heard an avalanche.

Neptune added as he was honestly scared.

Weiss:It's just (Y/n) and Hibari playing some imaginary game and somehow they're making those noises.

Weiss said as she walked past them.

Sun:What do you mean?

Sun asked.

Blake:(Y/n) and Hibari bought a large box and were playing a mountain climbing adventure when they somehow started making those noises.

Blake said in a short summary,so they could understand.

Neptune:Aren't they're a little too old to be playing with their imagination?

Neptune asked but....

Byakuya sighed, pinching the bridge of his nose.

Togami:Physically? Yes. Mentally? No.

This only fueled Monoma's growing frustration with (Y/n).

Monoma:Imagination doesn't make sense! It doesn't follow logic!

Monoma shouted, crossing his arms.

That didn't sit well with (Y/n), who simply replied..

(Y/n):You just need to believe, Monoma!

If there was one thing (Y/n) excelled at, it was bringing out the child in everyone—even his biggest skeptics like Monoma.

Though Monoma grumbled about it loudly, a part of him couldn't help but be intrigued by the concept of creating such elaborate worlds from a simple cardboard box,so Now seething, Monoma stomped off and angrily retrieved his own box, determined to replicate their "adventures."

Monoma quickly pulled out a large box that look like it could fit a person and pulled out a gay hat.

Monoma:.....Why haven't I worn this yet?

he asked before she tossed it aside and put himself inside the Box and sat in that box for a few seconds as everyone watched him But no matter how hard he tried—whether he pretended to scale a mountain, defuse a bomb, or sail the high seas—his box remained silent. Each failure fueled his anger. At one point, he accidentally kicked his box down the stairs and muttered an apology before Suddenly...

Cops:ATTENTION! WE HAVE YOU SURROUNDED! COME OUT WITH YOUR HANDS UP!

A police officer outside as the sound of multiple police officers and police cars could be heard outside.

Sun:YOU'LL NEVER TAKE ME ALIVE!

Sun Yelled as he quickly opened up the window and jumped outside,so the cops wouldn't get him.

Monoma:What do they want with me?

he asked scared as Kendo answered.

Kendo:I think you violated some new box kicking law.

Kendo said as she followed Neptune and Sun, who decided it was time to split.

Blake:That is stupid but then again who knows! they're a bunch of stupid laws!

Blake said as Monoma looked at the box with worry.

Monoma quickly picked up the box and all of them went Outside.

Monoma:Look, officers, it's okay!I won't do it again!

Monoma said before he dropped the box and his mouth grew wide as he couldn't believe what he saw as he saw and realizes the sounds of police sirens weren't coming from him—they were coming from The box!

All the police sounds and noises were coming from that Stupid box that the Small Idiotic group of Class 1A's Biggest Retards/(Y/n),Hibari,Kaminari, and Nora were playing in.

??:YOU'LL NEVER TAKE ME ALIVE COPPERS!

A male Voice yelled as the sound of gunshots and a tire screeching could be heard.

Cop:NO JOHNNY, DON'T DO IT!

an officer yelled as the sound of police sirens and vehicles pursuing the vehicle could be heard.

Monoma grew red in the face with anger As he kicked the box once again next to the bigger box where the immature 1A Students were playing with their imaginations.

As soon as the box came into contact with the other box,the four opened the first box making the noises immediately Halt and they were excited to see Another box.

Kaminari:Whoopie,Another Box!

Kaminari said as They pulled the box in before everyone closed the Box they were in once more and the sounds Resumed.

Monoma and the others couldn't believe what they were seeing and hearing so they decided to go back to their respective dorm rooms in their own dorms to calm their nerves.

Monoma:I just got to try and relax.

Monoma said as she felt like her nerves were getting to her.

Monoma:Perhaps we can drown out their childish games with a little TV.

he suggested as he grabbed the remote and turn the TV on.

"It is here that the box has reached their final stage."said a male voice.

the first channel turned out to be a factory of boxes, so he pressed the button again to change the channel.

"The equation is illustrated here in this box."said a smart looking old man in a wheelchair as he pointed to a chalkboard with the image of a box next to a complicated equation next to it.

he changed the channel once more.

"I couldn't afford a present this year so I got you this box."said a man as he handed his loved one a box.

"That is what I got you."said a woman that she handed the man a similar looking box.

Monoma:Isn't there anything on thing that isn't about boxes?!

Monoma asked in frustration as he changed the channel once again.

"And welcome back to championship boxing!"said an announcer as the next channel appeared to be a crowd of people waiting for a boxing match to begin.

Monoma:Hahaha, I guess this is okay. I mean it's not really about boxes.

he said as his eyes grew with dread as he saw something that he couldn't believe on the screen.

Instead of two boxers boxing it out it was literally two boxes hitting each other over and over again...?WHAT THE FUCK?!

Monoma:I give up....

Monoma Said before suddenly,he and EVERYONE heard something again.

THREE...TWO...ONE-BLAST OFF!

a countdown voice said as the sound of a rocket launching into orbit could be heard!

The group quickly rushed back to the roof as they quickly deduced where the noise was coming from as they heard the sound of people in space talking to one another through communication devices

Weiss:How are they doing that?

Weiss asked as she looked at the box through the window in her dorm room as it switches back to Monoma.

Monoma:That was the most realistic space launch I've ever heard! There must be a VERY LOGICAL explanation But What?Think,Neito,THINK!

he said as he began to picture a possible explanation.

In his mind,(Y/n),Hibari,Kaminari and Nora were giggling inside the Box and They continued giggling until (Y/n) motioned for them to be quiet as he pulled out a tape recorder and began to replay the launching sound.

(Y/n):Monoma's such a jerk!

(Y/n) said as he and his companions continued giggling before it returned to reality.

Monoma had a surprised face before it turned to annoyance.

Monoma:.........Laugh at Me,Will they?

Monoma quickly opened the box to see three of the four looking like they were driving with Nora nowhere inside.

Monoma:All Right,where is it?!

Monoma demanded until Nora popped out of the box that Monoma had accidentally given them.

Nora:Here I am.

Nora said as she popped her head out.

(Y/n):Where's what,Monoma?

(Y/n) asked as he didn't understand Monoma's question.

Monoma:Don't "Where's What Monoma" me! Where's the tape recorder?!

he asked as he and the other students tried to find a tape recorder as the group inside the building sized Box.

(Y/n):But We don't have a tape recorder.

(Y/n) said as he leaned out of the box.

Hibari:we have a tape recorder Box.

Hibari added cheekily.

Monoma scoffed and stormed off, muttering something about the "immaturity of certain individuals," but Kaminari from Class 1-A eagerly dove into the box with Hibari and toddler Teen (Y/n).

Together, the quad transformed their mundane surroundings into fantastical landscapes, battling mythical creatures, climbing impossible mountains, and flying helicopters made entirely of... well, nothing.

Their antics drew curious onlookers.

Some classmates rolled their eyes ("How juvenile," Todoroki mumbled) while others couldn't resist joining the fun, including Ashido, Kirishima, and surprisingly even Bakugou—though he refused to admit it was actually fun.

Eventually, they relented and invited Monoma aboard the SS Imagination. While the other students watched on with scrutiny, everyone squeezed into the messy mash-up of cardboard panels.

(Y/n):Welcome aboard everyone! You just set sailed on the SS imagination...

(Y/n):Where our only destination is fantastic adventures! Where do you want to go first?

(Y/n) asked as the group looked at each other wondering where they wanted to go.

Monoma:No, no, no. Don't mind us. We're just here to observe.

Monoma said as he wanted to see what they were doing to make those noises.

(Y/n):But Monoma and...everyone,don't you see?Waiting, watching, that's not what the box is about. It's about... imagination...!

(Y/n) said who once again created a rainbow with his hands, but Monoma had had about enough of that,so he started swatting it around until it disappeared.

Monoma:FINE!Take me to Robot Pirate Island!

Monoma said with venomous skepticism.

Yang:And I want to arm wrestle on the moon!

Yang chimed in.

Nora:Ooooh, okay!

Nora added, clearly having caught the bug of curiosity.

Yagyu crossed her arms but didn't leave. Nora whispered conspiratorially to (Y/n).

Nora:This is going to be so much fun.

The sound effects stuttered to life: mechanical beeps, pirate shouts, lasers booping, waves crashing, and even exploding cannon fire. Suspense filled the crowded box.

But no one had their eyes closed. No one let themselves be carried by the magic.

Monoma:It's not working.

Monoma groaned after slamming his fists against the box floor.

(Y/n):Because....

(Y/n) said softly.

(Y/n):you're waiting and watching. You're not... imagining.

The simplicity of the statement silenced everyone. It wasn't about making sense. It wasn't about revealing the trick. It was about surrendering to play, a lesson Monoma wasn't ready to accept.

Monoma:Alright, fine! If you don't want to show us, I don't care! I have better things to do than pace around on the floor, wondering how you four work this thing!

he'd declared, feigning disinterest as everyone got out of the box and made their way seemingly back to their dorm rooms.

[one moment later]

Monoma:HOW DO THOSE FOUR WORK THAT THING?! THERE'S GOTTA BE A SECRET BUTTON OR A SWITCH OR SOMETHING! I mean, listen to that!

The sounds of whirring gears and clashing swords echoed from the box, followed by booming pirate laughter.

Monoma:Now,That sounds Like Robot Pirate Island!!! Think Neito Think!I got it, when those idiots go to bed, I'll sneak in there and find that button. I'll wait all night if I have to!

After sitting in his chair all night due to not being able to sleep, The fighting coming from the box ceased as the sounds of pirates cheering and having a good time could be heard along with fireworks popping in the sky!

Unbeknownst to Monoma, a small group had been lurking just outside the box for hours, equally fascinated and perplexed. Then came the moment they were waiting for.

The box flaps opened, revealing a yawning (Y/n) and Hibari.

(Y/n): I need sleep to refuel my imagination tank.

He stretched languidly, his eyes heavy with exhaustion.

Nora, bouncing on the balls of her feet, exclaimed.

Nora:I still can't believe all those pirates beat those robots!

Kaminari, ever the showman, chimed in.

Kaminari:Did you see Captain Buckbolt, though? He was all, 'I'll get you swashbucklers back for this one day, I swear on my bionic blood!'

The four burst into laughter, a sound that grated on Monoma's already frayed nerves. As they dispersed, leaving the box unguarded, his moment had come. He darted out of his room, a shadow flitting through the darkness.

Monoma, with a mischievous glint in his eyes, sneaked towards the box after everyone was asleep but after going inside,He found a piece of paper on the side of the box.

Monoma:Hello, what's this?

He read aloud, 

Monoma:'This plaque is to commemorate the brave pirates who gave their lives to keep this box safe from the Robot Menace. Lest we forget...' Oh!

He tore the paper into pieces in anger.

Monoma:I've gotta find that button quick!

He frantically looked around the box.

Monoma:It's gotta be around here somewhere. I don't see anything! It's just an empty box! Maybe it really was their imagination.

he smacked himself for that.

Monoma:D'oh, get it together, Monoma! What are you saying? I mean, do I really believe that if I sit here and...

he turned an imaginary steering wheel.

Monoma:pretend to drive a race car, that I'm suddenly gonna start hearing noises?

He pushed his foot down on a pretend gas pedal, and the sound of an engine revving was heard.

Monoma:What the...?

He pushed the gear shift and came a sound.

Monoma:It actually works! I can't believe it! Ho-ho-ho! Oh, boy! This beats TV by a long shot!

He laughed.

Monoma:Whoo! Hahaha! This is the most fun I've ever had!

Unbeknownst to him, the noises were actually coming from a garbage truck, which lifted the box into the other garbage.

(Y/n) heard the commotion and smiled, knowing Monoma was finally experiencing the magic of imagination.

(Y/n):Listen to that... I knew Monoma would finally make the box work... That is so great.

Monoma, oblivious to his surroundings, was lost in his imaginary race.

Monoma:Whoo! Vrooom! Only two more laps 'til the finish line!

The garbage truck dumped out the trash, including the box.

Monoma:I'm in the lead! Out of my way! I'm almost there!

He laughed as the box slid down a trash pile.

Monoma:Whoo-hoo-hoo-hoo! Victory is mine!

The box hit something and opened, sending Monoma tumbling down the trash pile, landing face-first onto a cherry pie. He groaned as the box fell on him.

The next morning, (Y/n), Hibari, Kaminari, and Nora emerged from their rooms to find the box gone.

(Y/n):Hey,our box is gone!

Hibari:Oh well.

Hibari said nonchalantly.

Nora:I know! Let's go see Monoma!

Nora suggested excitedly.

Kaminari:Hopefully, he's not too down in the dumps today.

Kaminari added.

.....Oh.....the irony of that statement.