Kenta was born as the youngest of three brothers. From his mother Kiyoka's perspective, he seemed like a quiet child who didn't assert himself. One year in the spring, Kenta and Kiyoka's lives changed in a hectic manner, with their two older brothers starting to live alone and their father being transferred to a new job. Kiyoka feels a sense of loss when her lively house suddenly becomes quiet. Seeing his mother in such a state, Kenta feels lonely and frustrated, and tries to regain his mother's love, which he was unable to monopolize until now.