Yusuke is invited to his girlfriend's house for the first time, but he is so nervous that he arrives earlier than planned. However, it is not his girlfriend but her mother Chitose who is waiting for him. The two end up waiting together while she goes out shopping. Yusuke is intrigued by Chitose's chest, which is sexier and more erotic than his daughter's. Seeing Yusuke's innocent state, Chitose is unable to suppress the lust that has been rising up in her for the first time in a long time, and ends up teasing him with her adult sex appeal...