When Eren started releasing bursts of steam from his titan body, [Y/n] grabbed onto Armin once again and unhooked herself from Eren's body and soon as Armin pulled out his blade from his friend's neck and undid his gear as well he was pulled off of Eren by [Y/n] quickly to a roof on the opposite side of them. "Nice job waking him up Armin!" [Y/n] called out to him over Eren's titan scream, he in turn, gave her a relieved smile and they both watched Eren pick up the boulder. "Go Eren!" She cheered as he started heading to the wall, "Armin stay with him alright?" She told him and put her blades back into their sheathes temporarily. In her pocket she carried her phone and earbuds, "I need just some background music while I take a few titans out up ahead." one that would increase the energy she was gonna let out when she takes it out on the titans. The song she chose to listen to was Still Into The Dark and to be safe, she hid the ear buds in her ears with her hair. Once the music started playing, she took off with a sadistic grin on her face and a wild look in her eyes. She didn't have to hold back.
Each step Eren took not only sounded like a thud but it also vibrated against the ground. Armin delivered the news to Mikasa and the order was given to keep Eren safe from the titans. [Y/n] ran after the ones getting close to him and moved to the beat, slicing at the necks while she had her attention locked onto them. Each step Eren took was a determined one to set himself and the rest of humanity free from the titans. The other soldiers leading the other titans away from Eren were either crushed underfoot by the titans, slammed to the ground by their inhumanly large hands or eaten by them. However one was still in the way of the gate, Mikasa ran faster to take it out but was beaten to the titan by Nico, still alive, who had cut its eye to blind it. And along the wall, [Y/n] sling shot herself to slice down on its neck, taking it down all together. With no more titans in the way, Eren was able to slam the boulder down over the hole. Finally, humanity won a battle against the titans. With tears of joy in her eyes, Nico loaded the flare gun with a yellow one and sent it into the air, signaling that the battle was won for the first time in human history. That signal was to let all soldiers know that the mission had been a success.
[Y/n] took the earbuds from her ears and placed them back in her pocket but there was no time to relax quite yet. There were still titans left in the town yet to be taken down. Eren still had not pulled out of his titan form quite yet and Mikasa was not going to leave him behind. Armin was already at Eren's neck trying to pull him out but he was scorching hot to the touch. "[L/n]! Help us buy them time!" Nico ordered, being the only surviving captain from the elite squad. With a nod, she flew forward as well as she could, intending to help cut at least one down while they took care of the others. Two had slipped by and gotten to Eren and Armin despite their efforts. "Eren! Armin!" [Y/n] tried to get to them faster but in her haste, failed to notice a titan in her blind spot and was grabbed tightly. The two were saved by an older male, shorter than them mind you but with a shorter temper as well, after he cut down one he used his gear to fly upwards and slice the neck of the other. Once they were cut down, the man landed on top of the fallen titan's head. "Who was that...?" Armin asked as he held up Eren, joined by Mikasa who stood next to them. "Pay attention kiddos," the man spoke and looked at Eren's decaying titan form behind him, "This is the part where you explain to me what exactly it is that I'm looking at."
"Little help here!" [Y/n] managed to call a little attention to herself causing the those who were watching to watch with wide eyes that their friend was being held by a titan. "Damn. And here I thought I was gonna make it home in one piece." [Y/n] laughed breathlessly despite the tears burning her [e/c] eyes. She struggled to get her arm free and get a weapon but she was going to be in the titans mouth shortly. The group wasn't ready to lose another friend but she was too far for any of them to get to her and there were no building for them to use. With fear filling her body, [Y/n] watched as the mouth in front of her opened, showing her giant, human sized teeth ready to crunch down on her smaller form. "I remember death so much it feels more like a memory," With tears falling down her face, she closed her eyes preferring not to watch herself get eaten, "When's it gonna get me? On my feet? Seven feet ahead of me?" recalling the words of a line from a musical. Even though her eyes were closed, she could feel her heart pounding in her chest, the sound seemingly in her ears too. "Guess my luck ran out."
Thankfully she was wrong, she wasn't going to die. It was quick but it definitely took out the titan and got her free from the hand held her close, "Well that was a close one, wasn't it Miss [L/n]?" the voice was familiar to her, she knew that voice! She'd recognize it anywhere and she hasn't heard it in years! Opening her [e/c] eyes, the one who had saved her was her teacher, Korosensei. Soldiers quickly moved, holding their blades defensively as they stared at the being carefully since they didn't know if he was an abnormal titan. A very abnormal titan. Seeing a yellow creature with tentacles and odd clothing was not normal there and they were waiting for [Y/n] to ask for them to save her. Instead she started crying happy tears and hugged him, "Korosensei!" she started wailing, not caring that the others were surprised she knew him or that she was crying in front of them. She was happy because not only was she alive but she got to see her teacher once again. "Oi brat!"
The one who interrupted them was the same man who had saved Eren, Mikasa and Armin from the other two titans. She let go of her teacher and wiped her eyes and looked at him, still shaking a little as she tried to regain control of her body. She remembered him, Eren said his name was Levi Ackerman, he looked annoyed. "We're gonna need you to explain what the hell that is and how do you know that thing." The look in his eyes was screaming that she didn't have a choice in the matter but Korosensei didn't quite care at the moment. "I'll happily explain," Korosensei answered for his student, "But I need to get my other students first, I'm sure they're safe but they must be very worried about their classmate." [Y/n] perked up more knowing that her class was there, that she'd get to see them again. To make sure that it wasn't a ploy to escape, Levi accompanied them with a lot more soldiers to the building Korosensei had his students stay with Karasuma and Irina. When they saw their older classmate, they were surprised to see how much she's aged but they were still happy to see her.
Thanks to the coordinated efforts of the Scouts Regiment and the Garrison Regiment's core of engineers and Korosensei's speed, Wall Rose stood once more as a bulwark against the titans. It was almost a full days work batting away the titans that corralled Trost's perimeter, during which the canons fired ceaselessly. Most of the titans nearest to the wall were wiped out by explosive shells, once the smoke cleared those that remained were wiped out by the Scouts regiment. During the clean up operations, two titans were captured for studying, a four meter and a seven meter. All tolled there were 207 people were either dead or missing. 897 were counted among the injured. While Trost had been a great victory, the number of soldiers lost was much greater than there would be for a celebration to be in order.
While [Y/n] was in the dungeon with her classmates, she was happy to see them but still upset and saddened. She did not know which of her friends were still alive, she wasn't going to blindly hope that they were all among the living. She was trying to accept that many of them died and she wouldn't have been able to say goodbye to them. She would've looked out the window if there was one but was satisfied filling in her classmates and teachers about what she's seen and been through. The group definitely didn't care that Commander Erwin was listening, as was Captain Levi and the Military Police guarding their cell. They were rather surprised to have learned that [Y/n] [L/n] came from a world much like their own except there were no titans, no walls, better technology and humanity wasn't on the verge of extinction. Even more so that Korosensei was an earthling born and bred. From what they could tell, [Y/n] was basically a kid like the rest of those students. She wasn't a threat but she and the rest of them could be useful in wiping out more of the titans. They now had a goal in mind for the girl and her classmates and teachers, have them trained and be part of the scouts.

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Attack on Assassination Classroom x reader
FanfictionLike the title says this is a crossover of AOT and Assassination Classroom; while reader and your classmates were trying to assassinate Koro-sensei despite the large gap in abilities, during one of the government's attempts something went wrong and...