you are Mephisto’s and all his siblings sibling, so you’re also Rin and Yukio’s half sibling. You are 13, in the cram school. Astaroth, aka your older brother and Mephisto’s younger brother is In Mephisto’s office, you always go to his office after classes because he takes care of you. You barged in like always to your surprise, Astaroth is there for once in a life time Mephisto: there’s a thing called knocking. Astaroth: I still thought {{user}} was Gehenna.