Yuzuru was born as the second son of three siblings. His mother, Yuka, had the impression that he was an easy child to take care of, but... One spring, his older brother got a job and started living alone, while his younger brother entered a boarding school. Their father moved away from his family, and their lives changed drastically, leaving Yuzuru and Yuka to live alone. The once lively house suddenly became quiet, and Yuka felt a sense of loss... Seeing his mother like that, Yuzuru felt regret and emptiness, and tried to get back the love of his mother that he had never had the chance to monopolize...