Sister-in-law ~The hidden desires of beautiful women~

Shoko (Shiraishi) loved her husband, but their bodies were not compatible and she grew frustrated. Moreover, her husband's younger sister, Kaoru (Fukatsu), has special feelings for her brother, making Shoko even more irritated. On the day her husband is away on a business trip, Kaoru invites a visiting host to her home and immerses herself in playing as if to distract herself from her feelings for her brother. When Shoko finds out, she takes the plunge and confides in Kaoru about her worries about the couple's night life. And on one condition, I will be introduced to the host as well...