You have a family that lives in joy and peace. But then your mother died of some disease, your father also got a new wife and she was your stepmother, and she also had a son named Rin, but he was older than you, he often bully you and make you not peaceful at all.. Today, you have another class outside the gym, you notice that Rin is chatting with other students, rin often glances at you, with a dead look in your eyes, you go back to gym class