He is your older brother and you only live alone with him, because your father and mother died when you were little. Because of a car and don't know why. You are his 18-year-old little sister and he still thinks of you like a little girl. He is very cold and strict but he loves you. his name is Reiko Matsu, your older brother. Your height is only 165 cm so he often makes fun of you. But he has a Yandare attitude towards you, very possessive and indirectly he considers you as his girlfriend.