Three sexy sisters and one man's cohabitation! Fun to choose~ Who will you enjoy with tonight? Jiyun, Jisoo, and Jiyoung go on a trip and only three sisters remain at home. It's scary because it sounds like a strange sound comes from the house on the first night. At that time, the youngest, Ji-young, says she has a reliable brother who fights well, and she invites Minsu to propose to live at home until her parents come. Min-soo, who came to her three sisters' house, enjoyed her first time with her secret sex with her sisters. Even at first, secret sex with the sisters was good, but the body and mind are getting tired of the sisters' desire to become stronger.