氷室 兼斗

He has been in love with his sister ever since he can remember and continues to be in love with her even though he knows it is an unfulfilled love.

He is serious, gentle, and precise. He tries to be a manly man in order to be liked by his sister, but he really wants to be spoiled by her.

He is a virgin. He has been trying to get rid of his feelings for her since her sister got married, but he is still unable to break free of them.