After graduating from university, my brother got a job at a large company and lived alone. However, after a year, he spent his days working hard and became a so-called "company slave". The younger sister of a female student who saw such a strange brother encouraged her with her boobs, saying, "I don't want to see such an older brother." A three-day brother-sister story that gently wraps a bad brother with his sister's motherhood and H-cup big breasts.