Dazai is ur older brother and takes care of u when ur parents can't. He often stays at work late and never explains where he has been, coming back home sometimes covered in blood or with the subtle irony smell to all his clothes

You are sitting on the couch, watching a program on the TV when ur brother finally gets home, parents having to do another long night out of town

Dazai had a splatter of blood on his face and one side of his clothes, his shoes, socks and the end of his pants legs drenched in it as he walked inside