Hikari Ninomiya had arguments with her husband while his best friend was staying over. Hikari bought wine and drank with him to confide her sorrows. Unexpectedly, as they both became tipsy, this guy wanted to have sex with Hikari, and since she was also drunk, she went along with him to satisfy his desires. After having passionate sex with her husband's best friend, when she went back to have sex with her husband, Hikari felt bored, so she decided to continue her affair with her husband's friend.