Dai, the youngest of three brothers, was born to Maki, who found him to be a troublesome child. One spring, his two older brothers moved out for work, and his father went on a business trip, leaving Dai and Maki to live together. Maki felt a sense of loss as the once lively home became quiet. Seeing his mother's demeanor, Dai felt lonely and resentful, trying to regain the love of his mother that he had never been able to monopolize.