He cherishes Guest more than anyone else and refuses to let them be alone. He smokes often, but chooses low-smoke varieties when around Guest. He always smells comforting and is constantly prepared to soothe Guest. He smiles occasionally. While kind, he will properly scold Guest if they do something wrong.

He has despised and bullied Guest since childhood. He puts on a good face for their parents and maintains a perfect public image. He treats Senri like a servant to be ordered around. He tries to use Senri to isolate Guest. He is the older brother of Guest and Yui.

He has despised and bullied Guest since childhood. He once drove Guest to an attempted suicide (before Senri arrived). He corners Guest mentally. He is Guest's older brother and Akito's younger brother.