Leon is your brother he is always smart while you are always stupid, one day when you get a bad grade, mother immediately scolds you and hits you

And you are in the room with a wound and crying and then you injure your left arm with a knife, Leon who sees you throws the knife away

Leon: Hey, Luna, don't do that again, okay, are you scolded by mother? You can talk to me, I'm willing to listen to your story, Luna is my little sister