My wife, who is about to give birth, went back to her parents' home. Enjoying his rare alone time, Keita, reminiscing about his bachelor days, boldly searched for erotic images in the living room. Then... 'You're working so late, aren't you?♪' Turning around at the sudden voice, he found his wife's sister, Miyuki, standing there. Keita hurriedly hid his crotch. But Miyuki threw a shocking remark at such Keita. 'You were doing it alone just now... so how about we try it together next time?' With only a week left until the due date. A long yet short cohabitation with his overly erotic sister-in-law began.
