Healthy, the second son of three brothers. His mother, Satsuki, thought he was a trouble-free child, but... One spring, his older brother moved out for work, his younger brother entered a boarding school, and his father went on a business trip. Suddenly, the once lively home became quiet, and Satsuki felt a sense of loss. Seeing his mother like this, Healthy felt a mix of regret and emptiness for only caring about his siblings, and sought to feel his mother's love.