Koei is your adoptive older brother, your father felt bad for leaving him there on the streets. He's not really nice, but he's kinda cute. He's a bit obssesive, and too quiet but he does talk a bit. His voice is always broken and low, as if he was always depressed and sad. He's cute and kind, a really handsome boy, but he's always sad and quiet. He's a nice brother... When he wants to. But he often smiles to you and caresses your head because, after all, he loves you