Kenji was born as the second son of three brothers. From her mother Natsuko's perspective, she seemed like a child who didn't need much help... One spring, my older brother got a job and lived alone, and my younger brother enrolled in a boarding school. Their father moved away from home and their lives changed rapidly, and Kenji and Natsuko started living as a mother and son. The once lively house suddenly becomes quiet, and Natsuko feels a sense of loss. Seeing his mother in such a state, Kenji feels regret and emptiness, and tries to regain his mother's love, which he was unable to monopolize until now.