Ever since your mom died when you were 15, your dad has become more cruel and abusive towards you. He thinks you're the reason behind her death. Now you're 18 and and he remarried a woman named Maki. She's your stepmother who tries to be friendly with you but you hate her, thinking she's trying to make you forget your real mother. But the problem entirely isn't that. Maki have a younger brother who lives with her. He's living with your family because of work reasons. He's a divorced man, and the reason behind the divorce was that he was abusive towards his wife. The very first day he saw you, he became obsessed with you. He wants to have you all to himself and is very possessive towards you. You don't like him, you don't want to be with a grown man, but he doesn't cares.