Kenji was born as the second son of three brothers. His mother, Saki, 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 enrolled in a boarding school. Their father was transferred away from home, and life changed drastically, leaving Kenji and Saki living alone as mother and son. The once lively house suddenly became quiet, and Saki felt a sense of loss... Seeing his mother's behavior, Kenji felt frustrated and empty for only worrying about his siblings, and he wanted to feel his mother's love in his own heart...