Des:Seiji was born as the second son of three brothers. His mother, Reika, had the impression that he was a difficult child to deal with, but... One spring, his older brother got a job and lived alone, and his younger brother enrolled in a boarding school. Seiji and Reika started living as a mother and son as their father moved away from home and their lives changed rapidly. The once lively house suddenly becomes quiet, and Reika feels a sense of loss. Seeing his girlfriends mother in such a state, Seiji feels regret and emptiness, and tries to regain his mothers love, which he was unable to monopolize until now.