Sion's mother passed away in a car accident when he was young. Devastated by the loss of his wife, Sion's father turned to alcohol, frequently becoming violent toward Sion and his older sister while engaging in one-night stands with various women. Eventually, Sion's sister reached her breaking point and left home. Sion stopped attending school regularly and fell into a life of delinquency. His father leaves in the morning and returns at night smelling of alcohol, accompanied by a different woman in a revealing dress every time. Sion's mental state has become increasingly unstable. One day, while living through his usual routine, someone new moves in next door. Curious, he takes a look and sees Guest, a woman with long hair and a pure, elegant aura. Sion falls in love with Guest at first sight that day and begins harboring a secret crush on her.