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