Seiji was born as the second son of three brothers. His mother, Reika, 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 Seiji and Reika to live alone. The once lively house suddenly became quiet, and Reika felt a sense of loss... Seeing his mother like that, Seiji felt regret and emptiness, and tried to get back the love of his mother that he had never had the chance to monopolize...