Izuku, Arcturus, and Wanda were having a good time at UA with making new friends and all. The second trial was combat training which is a game of hero and villain teams. The hero team's job is to capture the weapon or caught the villains while the villains' job is to protect the weapon. 

Arc and Wanda were on a team facing Katsuki and Iida, the siblings won at the end. Even though the hero team won, Iida was giving the MVP.  

Momo then explain that Iida truly adapted to his assigned role. Example with Katsuki having a personal grudge against Arc as demonstrated with a large scale blast that could've killed him had he not dodged it. And Arc's plan wasn't entirely better as it also caused a lot of damage to the structure. Wanda had let her guard down a bit in the midway and her last attack was reckless given the stakes. Iida was prepared for any arrival and never lost sight of the mission.

All Might said she was right even though she did over looked some stuff. Anyways, they would move on to the next battle with Team A (Midoriya and Uraraka) and Team L (Shuri and Robbie). Eventually Izuku's team won as the list goes on. 

It was afternoon, after a bit, Izuku admitted that just before Arc arrived, he had told Bakugo that his quirk was borrowed. He even admitted that he didn't even tell his mother about any of this, but for some reason felt like he had to explain it to Katsuki. All Might admitted that Izuku wasn't the kind of person to show off, so didn't lecture too much about it.

The next day was Class-A was getting a class rep and deputy. The top ones are Momo with 3 votes, Izuku with four votes, and Arc with surprising 10 votes. 

Izuku: (shocked) How did I get four votes?!

Arcturus: Why vote me?! I said I DON'T want the job!

Katsuki: (stands up pissed) Okay, you idiots, who voted for them?!

Sero: What, did you honestly think anyone was gonna vote for you?

Wanda: Yeah, you'd be the worst pick.

Katsuki: What did you say, Witch Girl?!

Wanda: You heard me. 

Ochaco: (thoughts) Maybe I'll just keep my vote to myself.

Iida: (shaking in disappointment) One vote... I feared this might happen, but I can't argue with the system I chose! 

Hitomi: (thoughts) I chose to vote him because I felt he would do a better job at it. I kinda feel sorry for him. 

Momo: So you voted for someone else, huh?

Shuri: That's a bit of a surprise.

Sato: But you knew it was best to vote for yourself, right? What were you trying to prove here, Iida?

Soon, they had Arcturus and Izuku up at the front of the class. Arcturus was class rep and Izuku was deputy. Izuku was shaking in nerves while Arc looked bored and a bit annoyed.

Arcturus: (sighs) why me? Just why?

Tsuyu: This might not be so bad.

Kirishima: Yeah, I can get behind Farron.

Arcturus: (sarcastic) Yay...

Wanda: Oh, quit your bitching. You two will be great.

That's what she said. But when the press suddenly entered UA with questions regarding All Might a teacher there, it set off an alarm and the students began panicking. Iida managed to put all the students at ease. 

He was loud and confident enough to tell everyone it was okay. It worked and they relaxed better. Later on in the day, they were back in class and both Arc and Izuku had an announcement.

Arcturus: Before we being all the major stuff like the other officers, Izuku and I have something to say. In short summary, we resign our positions.

Students: What? You're stepping down?

Arcturus: I'm flattered that you chose me to be your class rep. But I'm not looking into being in the leadership role yet. And Izuku has talked to me, and he's not looking for that kind of role either. So, after thinking it over, and thanks to the demonstration from earlier, we decided to have Tenya Iida step up as class representative, and Momo Yaoyorozu as deputy.

Both of them gasp in surprise by that claim. And thankfully, the others agreed. They accept the roles and moved on with the day.

(time-skip) 

In the afternoon, Aizawa announced that they'll be having four instructors (himself, All Might, Cynthia, and another teacher). Reason being was they were doing rescue training with natural disasters and accidents. This pumps everyone and Aizawa informs that they can wear whatever, and that the training's off site so they need to go by bus.

They were soon down at the station where almost everyone was in costume except for Izuku. He had his gloves, belt, elbow and knee pads, and lower mask. But was in the training uniform.

Sambamhaw: If you're wondering about the hero outfits for Arc, Wanda, Shuri, and Robbie. There they are. 

Arcturus's outfit:

Wanda's outfit: 

Shuri's Outfit:

Robbie's Outfit: 

Ochaco: Deku? Why're you wearing your PE clothes? Where's your costume at?

Izuku: You saw it after the combat training. It was kinda trashed.

Shuri: Sorry about the mask.

Izuku: It's alright, Shuri. The support company's working on it.

Arcturus: (without his mask) Knowing them, they'll make it better.

Iida: (blows a whistle) Gather around, Class 1-A! Using your student numbers, form two neat lines so we can load the bus efficiently. (blows whistle)

Arcturus: It hasn't even been a day and already he's getting into the role.

Izuku: Yeah, he's really kicking it into high gear as our class rep.

They were all soon in the bus where most sat in the side seats. While most had casual conversations, Arc was trying to take a nap.

Arcturus: (to Wanda) wake me when we get there. (sleeps)

Mina: He looked energetic earlier. Another side effect from his quirk?

Wanda: Nope. Arc usually runs to places, so he likes to take naps if he's using transport.

Kirishima: Ain't nothing wrong with that.

Arc slightly tuned out the conversations, but he did catch words every now and then. Including how Katsuki was getting teased. It almost made him laugh as it was like his and Izuku's positions were getting switched from when they were in middle school.

Wanda then noticed a bracelet around Kyoka's hand, a pendant around Momo's neck, and a pinky badge on Mina's shirt. 

Wanda: Those are pretty nice things you girls have there. 

Momo: Oh these? Y/N gave them to us, (frowns) before his... you know. 

Ochaco: Y/N, (to Wanda) he was your other brother, right? 

Wanda: Yeah, adoptive brother like Arc. (looks at the three girls) So, what did you girls do together? 

Mina: Oh, we had lots of fun! 

Kyoka: It was probably one of the best days we had. 

(flashback) 

10 months ago, before Y/N's mom went into a coma, Kyoka and Momo were taking Y/N to a mall. 

Y/N: You took me to a mall? 

Kyoka: Why not? We thought this would be the perfect place to cheer you up. 

Momo: Plus, we invited someone who wanted to come along to. 

Y/N: You did? Who? 

???: Hello! 

He turned to see a girl with pink coloured skin, pink hair, yellow horns on her head, and yellow eyes with black irises. 

Mina: Hi, you're Y/N, right? I'm Mina Ashido, nice to meet you. 

Y/N: (blush) Um... nice to meet you too. 

Mina: The girls told about what happened with you. It was pretty bad that you got rejected, but it'll be alright when the three of us make you feel better. 

Momo: Trust me, enjoy'll it. 

Kyoka: Now come on, let's have some fun. 

Mina: Yeah! 

Mina and Momo both grabbed his hands as they and Kyoka started exploring around the mail. Y/N couldn't help but felt warmth from these girls. It made him started to smile. 

The first thing they did was went out shopping for clothes, then they went to have ice cream and milkshake, after that they went to an arcade to play some games, and finally, Y/N bought the girls some gives as appreciation for the fun they had together. 

Mina: Wow, that's so kind of you cute! 

Momo: It is pretty. 

Kyoka: Thanks Y/N. 

Y/N: No problem. It's my shoutout for you girls helping me so far. 

Momo: Thanks. 

Y/N: (looks at his watch) It's getting late, I better get going. 

Mina: Yeah, so do we. 

Kyoka: It was great hanging around with you. 

Y/N: (smile) Yeah, thank you so much. 

The girls couldn't help but blush at his smile, they all think it is so cute. 

Momo, Kyoka, and Mina: (thoughts) OH MY GOD!!! HOW COME NO GIRL HAS FALL IN LOVE WITH SOMEONE SO CUTE?!?!?!

(flashback ended) 

Wanda: (smile) Sounds like you girls had a good time with Y/N.

Mina: Sure did! Hanging out with him was the best! 

Momo: These gifts are all we have of him. 

Kyoka: And that's why gonna become heroes for him. 

Arcturus, Wanda, Izuku, and Hitomi: (thoughts) Y/N... 

The nap was soon stopped as Aizawa announced that they had arrived. They get off the bus where they meet Cynthia and another woman wearing a space suit.

Thirteen: Hello, everyone. We've been waiting for you.

Students: (gasp in surprise)

Izuku: It's the Space Hero, Thirteen! And the Dragon Strength Hero, Wyvern! They're chivalrous pros who've rescued a ton of people from disasters across the world!

Cynthia: (chuckles) It's good to see you as well, Midoriya. (to Arc and Wanda) You two aren't getting into trouble again, are you?

Both: No, ma. 

Ochaco: (surprised) Ma? Wait, she's your mom?

Wanda: We'll explain later.

Thirteen: (gestures to the entrance) I can't wait to show you what's inside.

Students: This is gonna be awesome!

They enter the large dome where they see a massive area with different terrains. 

Kirishima: Holy crap! It looks like some kind of amusement park!

Robbie: Impressive.

Thirteen: A shipwreck. 

A landslide. 

A fire. 

A windstorm. 

Et cetera—I created this training facility to prepare you to deal with different types of disasters. I call it the Unforeseen Simulation Joint. But, you can call it, 

USJ!

Students: (collectively) Just like Universal Studios Japan.

Aizawa: (approaches the two teachers) Hey, shouldn't All Might be here already? Lemme guess, he booked an interview instead.

Thirteen: (in a more hushed tone) Actually, it's something else.

Aizawa: Hm?

Thirteen: Apparently he did too much hero work (holds three fingers up) On the way to school this morning and used up all his power. He's resting in the teacher's lounge

Aizawa: That man is the height of irresponsibility.

Cynthia: Says the man who doesn't take a break except in regular school stuff.

Aizawa: (thoughts) Well, we should be okay with just the three of us. Especially since Cynthia's strength should be on par with All Might's. (speaks) Clock's ticking. We should get started.

Thirteen: (to the students) Excellent. Before we begin, let me just say one more thing. Well, maybe two things. Possibly three, four, or five.

Cythina: (sweat drop) Thirteen.

Thirteen: Listen carefully. I'm sure you're aware I have a powerful quirk. It's called Black Hole. I can use it to suck up anything and turn it into dust.

Izuku: Yeah, you've used Black Hole to save people from all kinds of disasters before, haven't you?

Ochaco: (nods her head in both understanding and excitement)

Thirteen: That's true, but my quirk could also very easily be used to kill.

Some of the students gasp by this.

Cythina: Many of you also have powers that can be dangerous. In our society, all quirks are certified and stringently regulated, so we often overlook how unsafe they can actually be. None of you forget that if you loose focus or make the wrong move, the powers you have can be deadly. Even if you're doing something virtuous like rescue someone.

Thirteen: Thanks to Aizawa's fitness tests, you have a solid idea of your quirk's potential. And because of All Might's combat training, you likely experienced how dangerous your powers can be when used against other people. Carry those lessons over to this class. Today, you're going to learn how to use your quirks to save people's lives.

Cythina: You won't use your powers to attack enemies or each other, only to help. After all, that's what being a hero is all about. Ensuring the safety of others.

Thirteen: That's all from us. Thank you so much for listening.

The students cheered at this, and we're about to being. However, things went differently as the lights in the dome began flickering and Aizawa and Cynthia felt a darker presence here. 

They look down at the fountain, and see a wormhole opening, it opens up, and they see someone inside it. And that someone is Shigaraki. 

Aizawa: (to the students) Stay together and don't move! Thirteen, protect the students! Wyvern, with me!

Kirishima: (looks at the portal) What is that thing? 

Suddenly, multiple figures would begin to emerge through the portal with Shigaraki, further confusing everyone.

Kirishima: Wait, has the training started already? I thought we were rescuing people.

Arcturus: I don't think this is part of the training.

Aizawa: Stay back!

They then see him putting his yellow goggles on and soon plenty of people exit from the wormhole.

Aizawa: This is real. Those are villains!

Students: (gasp in shock)

Cynthia: All of you stay here.

They look out at all of them. Soon, a large Nomu with its brain exposed and large beck like mouth then walked out of the portal as well.

Arcturus: (narrator) We thought we were going to be practicing saving other people's lives that day, but when they appeared, we realized we were the ones in danger.

Chapter 3 ended. 

I hope you like this chapter. If you guys have any ideas, let me know at the comments below. Peace out and enjoy!