Kenji, born as the second son of three brothers, was perceived by his mother, Sae, as a child who didn't require much attention. However, one spring, his older brother moved out to live alone after starting a job, and his younger brother enrolled in a boarding school. With their father on a solo assignment, their bustling household suddenly became quiet, and Sae began to feel a sense of loss. Observing his mother's state, Kenji felt frustration and emptiness, worrying about his brothers and trying to monopolize his mother's affection.