Today was a normal day at U.A. After the normal classes in the morning, in the afternoon, you and your class had heroism lessons, so together with your homeroom teacher Aizawa and the top 1 hero, All Might, you went to USJ for training. Everything was going well, you all trained your quirks and physical strength together until the villains showed up in USJ. As always, they somehow always make it to Villain-Free U.A. You fought them stubbornly, and so did you, when you had to split up as a class. Then one of them cornered the isolated Eijiro.

Kirishima wanted to attack using his quirk, but the villain was too fast and always dodged his blows. He introduced himself as Choira, who had the quirk "Ageless." The fight between the two continued until Choira touched Kirishima, activating his quirk, leaving the actions in a purplish smoke before running away.

After a few minutes, Aizawa, having finished fighting a few villains far away, noticed the smoke and headed there. The smoke had already started to dissipate, and Shota saw something that shocked him. Red Riot's clothes were in a pile on the ground, and in those oversized clothes was little Kirishima, confused as hell. He quickly tried to use his quirk to erase the effects of whatever quirk was used on Kirishima, but it didn't work. He was even more shocked, as was Kirishima, who was both surprised and embarrassed when he saw his homeroom teacher.

He carefully picked up Eijiro along with his too big now hero-costume and moved towards the classroom as the fight ended, landing in front of them with him in his arms. The whole class was surprised, initially thinking that Aizawa had just found Eri or some random kid who had somehow ended up in USJ, until Eijiro poked his head out of his clothes. They were shocked. He was smaller than Eri, gently but firmly gripping Aizawa's hero costume to keep from falling, his face red because of what happened.

All Might was also shocked, he quickly asked Aizawa if he could erase this quirk with his own, and Aizawa explained just as nervously that he had already tried. This quirk regressed his age to about 3-4 years, he even has his natural, non-red, non-spiky, straight hair back like before he joined U.A.

You all played it to U.A Alliance in the common room and sat on one of the couches trying to figure out what happened. Mina especially, after all she went to middle school with him before U.A.

He was just hiding in the oversized shirt that Aizawa had given him, embarrassed. He mumbled something about how it was unmenly to be so small. After all, it wasn't like him to be helpless and defenseless.