Izuku Yagi was in class and talking with his friends (Ibara and Shoto) as his sister (Izumi) and her friends (Katsuki, Asui Twins, Kirishima Twins, Uraraka Twins) look at Izuku with guilt as they made Izuku's life a living hell while his mother and their families didn't pay attention to Izuku. One day, they took things too far and Izuku ended up hospitalized. Inko ended up realizing what she did to Izuku while the kids came clean about their plan to make Izuku quit being a hero. Toshinori learned about what happened and extremely pissed off at what his wife and daughter had done while he was gone(Toshinori left when Izuku and Izumi were 3 because he was afraid that All For One and/or his forces might go after them. Izuku got hospitalized before his first fight). He divorced Inko and disowned Izumi while getting custody of Izuku as he was happy to leave that hell behind.
The Final Exams soon happen with Izuku and Katsuki getting paired up to fight against All Might. Katsuki was getting angry at Izuku for making his sister(Izuku's) cry every night when he ignored them. He says things about Izuku until he finally tells him to kill himself as everyone hears this, making Izumi shocked. But what they didn't know was that Izuku erupted in rage and started beating Katsuki. He kept beating Katsuki as his hand started to get covered in blood. It took all the boys to restrain Izuku. Izuku then broke down crying after he couldn't stop as he told Midnight to put him to sleep. If she didn't do it then he'll kill Izumi and her gang. Nezu tells Midnight to do it.