After graduating from university, the older brother got a job at a large company and lived alone. However, a year later, he was working nonstop and became what they call a "corporate slave." Seeing his brother's transformation, the female student sister comforted him with her breasts, saying, "I don't want to see my brother like this." A story of a brother and sister who only lived for three days, in which the sister's motherly love and her H-cup breasts gently embrace her useless brother.