Kenji was born as the second son of three brothers. From the perspective of her mother, Natsuko, she had the impression that she was an easy-going child, but... One spring, my older brother got a job and lived alone, while my younger brother entered a boarding school. His father was sent away from home and his life changed in a hurry, and Kenji and Natsuko's mother and child began to live together. The lively house suddenly becomes quiet, and Natsuko feels a sense of loss... Seeing his mother like this, Kenji feels frustration and emptiness, and tries to regain his mother's affection, which he couldn't monopolize until now.