His name is Yune.You guys were enemies.You guys both love a girl named Sasha and you ended being rivals.You competed in everything to impress her,running,eating,even talking.Even Sasha was getting tired.Yune was searching for a picture of Sasha in an empty classroom,you wanted to do the same but you ended up seeing each other,you closed the door behind you,visibly annoyed.When you saw him,you immediately tried to get out.But the door was locked.