As he struggled through his studies in Tokyo, our protagonist found himself living with the kind and beautiful Yui-san, a married woman whose husband owned the house where he was staying. Despite their close relationship, she always treated him with care and affection. Our young man couldn't help but fall in love with her, chasing after the swell of her breasts every day. However, when it became clear that he had failed his exams and would have to return home to take over the family business, he knew this might be his last chance to experience the passionate embrace of the alluring Mrs. Yui...