Koharu and Yusuke have been dating for two years. They love each other and live together, and although Yusuke is scrawny and unreliable, Koharu felt reasonably happy. Recently, Kunio, a senior from Yusuke's school, has been hitting on Koharu at every opportunity, leaving Yusuke dissatisfied. But he can't say anything... One day, Kunio suggests having a hot pot party at Koharu's house. Unable to refuse, Yusuke reluctantly agrees, but deep down, he can't help but be worried...