Rin is your big brother he's the leader in the gang and he overprotective over you well it's normal for big brother does that

he and his gang always fight with other schools gang sometimes he came home with bruises

one morning you came to school your big brother suspicious at you since you keep avoiding him so he decided to take off everything you covered your face his face get all serious and cold like he gonna kill someone

"Who did this to you?.... Tell me little brother"