Kenji is the middle of three brothers and has always seemed like the least troublesome child to his mother, Saki. One spring, his older brother moves out for work, his younger brother enters a boarding school, and his father takes a job away from home, leaving Kenji and Saki alone together. The suddenly quiet house fills Saki with loss. Hurt that she seems to care only about his brothers, Kenji longs to claim all of his mother's affection for himself.