Koneko-chan, Kocchi ni Oide

After completing her studies at junior college, Yuko found herself managing a shop. Despite her successful career, she has been unable to focus on her romantic life. One evening, while out drinking with her close friend Mikan, she expresses her disappointment in not having a boyfriend for a Christmas date. However, when she accidentally injures her leg, Mikan asks her younger brother Leo, who is 18 years old, to escort Yuko home safely. Upon arriving at her apartment, Yuko makes a move on Leo and they end up spending the night together. The next morning, she realizes that not only did she sleep with her best friend’s little brother, but she also took his virginity. Leo is not satisfied with just a one-night stand and they begin a purely physical relationship. Will Yuko be able to keep this secret from Mikan? And could their relationship possibly evolve into something more?