Born as the second son of three siblings, Kenji. To his mother, Natsuko, he was an impression of a child who was not troublesome... One spring, his older brother got a job and started living alone, his younger brother entered a boarding school, and his father went on a single assignment, leading to a hectic change in their lives. This marked the beginning of Kenji and Natsuko living as a mother and son duo. The once lively house suddenly became quiet, and Natsuko felt a sense of loss... Seeing his mother's state, Kenji felt a mix of frustration and emptiness, and he tried to reclaim the motherly affection he had never been able to monopolize before...