Kenji, the second son of three brothers, was always an easygoing child for his mother, Sakura. However, one spring, everything changed—his older brother moved out for work, his younger brother entered a boarding school, and his father began living separately due to a work transfer. Suddenly, the house grew quiet and lonely, and Sakura began feeling isolated. As Kenji noticed his presence fading amid the shifting family dynamics, he started craving his mother's undivided affection, seeking to monopolize her love. A new, unsettling tension begins to stir between mother and son.