*[Y/N]'s POV*

I sense magical power it felt familiar I know it's him I approach the origin and I was right "What do you want now?" I ask the mage "hehehe.... I decided to give you a break kid, today I'm not gonna fight you I'm here to answers that you've got on your mind" okay then "what universe am I? and why did you bring me here?" I ask him "this dimension or universe is Attack on Titan, the reason why I bring you here is my little secret." "is there any way for me to go back to my own dimension?" "yes but you would have to defeat me, beating me is the only way you'll acquire my powers after then and transport anyone or anything in another dimension, but you don't have the power to defeat me... yet" "can you bring the Fairy tail guild here then?" "no way" he laugh I then found a way to make him change his mind "oh... you're afraid of losing to me since the whole Fairy tail guild is training me" "you piece of shit!!" "oh did I struck a nerve there" I taunt him even further "why, you... very well I'll prove to you that I'm right I'll bring your weak Guild here" 'all according to my calculation' "see you around you brat and don't expect me to be merciful next time we meet, I'll end your life next time" "I'll be waiting then, I'll beat you and free the humans from confinement" and then he disappear, suddenly I heard a Loud explosion I jump from building to building and thought another titan attack? I went to the tallest building and I saw Eren, Armin and Mikasa and Garisson platoon they were about to kill those three I use my enhance speed to get to them as fast as possible.

*3rd person's POV*

Eren is in a deep trance as he mumble "I'll Exterminate you all" as Armin is creep out by his face expression "E-Eren..." then he snapped out of his Trance-like state and surprise as they were surrounded by the garrison "Eren!" Mikasa exclaim "w-where's[Y/N]?" he ask the two "he sense something and went off without any hesitation" Armin said "he'll be back, don't worry" Mikasa said "you there, what are you?" Eren didn't understand the the question "I said are you a human or a monster?" Kitts said with a louder voice this time 'I must answer the right one' "My specialty is cutting flesh, if any of you want to experience this first hand then feel free to step closer" Mikasa said in a cold voice "Mikasa, don't fight against fellow human" Armin said "I don't care if they're human if anybody tries to hurt Eren I'll kill them" she stated "sir, That's Mikasa Ackerman one of our Elites, she alone is worth a hundred ordinary soldiers it'll be a great lost if we lose her so maybe we-" Ian stated before he could finish Kitts interrupts him "Shut up!!! I'll ask for the last time what are you!?" he ask "I'm human" Eren said but it didn't work Kitts raise his hand to signal to fire the cannon. Then Eren hurriedly went to Armin with Mikasa and bit his hand only to partially transform into a Titan which to everyone's horror "w-what happened?" Armin ask "Eren protected us that's all that matters now" Mikasa said as Eren approaches the to their surprise and ask if their alright, after that they argue about which course of action to take they've decided to let Armin convince the Garrison that Eren is not a threat Armin agrees and try to convince them but to no avail. Just as Kitts hand the signal some figure stop him it's...[Y/N]. "That's far enough I won't let you harm them any further" he said in a dark cold voice.

*Mikasa's POV*

The steams of the titan Eren made finally faded as The captain of the garrison is about to fire the signal for the cannon some figure stop him "That's far enough I won't let you harm them any further" a cold dark voice comes out of the figure and we saw [Y/N] holding the captains hand his face is serious as if he is about to kill him he then let down the captains hand and he approaches us "you guys alright?" he ask "yeah thanks for saving us" Eren replied "where did you go?" Armin ask "I sense the mage that attack us during graduation" he replied I run towards him and hug him "It's okay guys I'm here" then I heard 'as if I'd listen to a kid!!' Kitts signal for the cannons "Let's get out of hear!" I shouted "Shit, I wont make in in time" Eren said "Stay close to me"[Y/N] said as we do as he said then he raise his left hand against the cannon ball shell as light surrounded us "Holy shield of the light dragon" he shouted the shield deflect the cannon everyone is surprise by this "I warned you" a dark voice erupted from him again in a blink of an eye he unarmed every garrison members of their weapons and he make a scythe made from Ice just as he was about to slice Kitts someone stop him it was Commander Pixis he then calm down "a man of your cowardice couldn't even kill a mouse" he insulted as Commander Pixis and the whole Garrison laugh at Kitts. We four were invited to be on top of wall rose as we discuss the plan to retake Trost

*time skip after the the battle*

[Y/N] save many of our comrades and then the scouts appear and save us three. Eren is taken by the Military Police to decide which is his fate the Scouts and live or The Military Police and die.

*the day of the trial*

Both sides the Scouts and the Military Police then they use me as a witness and I said to them that Eren save me multiple times and they countered it as personal feelings 'personal feelings? I swear if you say anymore of this I'm gonna fucking slice you to bits' "alright I will have to make him decide your fate" 'him? who's him' then the door open up and they saw a figure that looks a lot like my age but his face is covered in a mask "good morning to you" Darius said to the mask man he only nodded "Please take off your mask so they will know who you are" the man takes off his mask most of us are shock to see his face it's[Y/N]'s "h-how do you know the commander-in-chief?" Nile ask "simple, I'll let mr. Darius explain" then the Commander in chief explain on how[Y/N] save his life during the expedition of the Scouts when he came to this world and he's indebted to him he call him the night before the trial he requested that he will judge Eren's fate "Shit, you've got to be kidding me this kid is humanities hope? that's a load of bullshit" Nile exclaim "do I look like I'm kidding. fine if you feel that way then die when the colossal Titan and Armor titan attack again then we'll see who's kidding and Nile when cadet Ackerman said that cadet Yeager protected her and Cadet Arlert and you say personal feelings, they're his friends of course he has to protect them do you see my point? if not then, can you please point out one of your friends" he pointed at someone looks like his companion "what will you do if I try to kill them? will you stand against me and put your life on the line? or you won't give a shit?" "p-point taken" he said in a fearful voice, his statement puts the whole court in silence Levi break the silence by beating the crap out of Eren which to my dislike as Armin stop me "My decision is Final cadet Yeager will be in the Scouts nothing more nothing less"[Y/N] said the trial has ended.

*Eren's POV*

We went to some room and[Y/N] entered "Thank you, I owe you my life" I said to him "no need to thank me we're friends after all" I was then Observe by Squad leader Hange she stated that my tooth Captain Levi kicked out grew back.

*time skip to the joining of each regiment*

Commander Erwin of the Scouts introduce himself to the new recruits and told his plans on using my powers to retake wall maria and take a look in the basement in shiganshina. I saw Mikasa and Armin the next day I call out to them "Eren, did they do anything to you like subjecting you to any cruel experiments or mental torture?" Mikasa ask in Concern "no, nothing happen" I replied then her face becomes scary "that midget is going to pay for what he did to you, I swear I will make him pay for it someday" she said "wait, you mean Captain Levi?" I ask then the 104th top 10 are here and even Jean unfortunately Annie took the Military Police.

*Mikasa's POV*

"Where's[Y/N]?" I ask Eren "oh, right he's in his room second floor the first room, by the way Commander Erwin offered him a spot as a Captain but he turned him down[Y/N] said that he'd be better off not a leader but a protector" I was shock by the statement he's given, I went to his room and knock "come in, it's open" he replied "Mikasa? is there something wrong?" he ask "nothing it's just that I wanted to thank you for saving him I owe you my life" he then got up and poke me on the forehead "there's no need to thank me I'm your friend it's the least I can do." he said smiling "after all I want you all to be free from this confining wall and see the true beauty in this cruel world." he said and we left his room to join the others in the mess hall