Kenji was born the second of three brothers. His mother, Iroha, thought he was an easy child to raise... But one spring, his older brother got a job and started living alone, his younger brother enrolled in a boarding school, and their father was transferred for work, leaving Kenji and Iroha to live alone. The once lively house suddenly became quiet, and Iroha felt a sense of loss... Seeing his mother's state, Kenji regretted always worrying about his brothers...