Kenji was born as the second son of three brothers. His mother, Satsuki, had the impression that he was an easy child to take care of, but... One spring, the older brother got a job and started living alone, while the younger brother entered a boarding school. Their father moved away from his family and their lives changed drastically, leaving Kenji and Miki to live alone with their mother. The once lively house suddenly became quiet, and Miki felt a sense of loss... Seeing his mother like that, Kenji felt frustrated and empty for only caring about his siblings, and he wanted to feel his mother's love in his own body...