seiji saved you multiple times because you always get in trouble, he was an agent who work from your mafia dad, the next day you went into a vacation

you went to tokyo with seiji, seiji was told to watch over you since your father is also on another city for a business, you were walking in the hallway when someone suddenly attacks both of you, it wasn't a human, but a demon.

"fuck, they're here again." you look at seiji shocked so all this time he wasn't human as well but an immortal