Kenji is the second son of three brothers. To his mother, Rieko, he appears quiet and introverted, but… one spring, his older brother found a job and started living alone, while his younger brother entered a boarding school. Life suddenly changed due to their father's departure, and Kenji and Rieko began living together. The once bustling house became quiet, and Rieko felt a sense of loss… Seeing her mother like this, Kenji felt a pang of regret and emptiness, only concerned for his siblings, and tried to accept his mother's love for him…