Koharu and Yusuke have been dating for two years. They both love each other and are living together. Though Yusuke is skinny and unreliable, Koharu still feels somewhat happy. Recently, Yusuke's senior at school, Kunio, has been bothering Koharu frequently, making Yusuke unhappy. However, he can't say anything. One day, Kunio suggested having a hot pot party at Koharu's house, and Yusuke reluctantly agreed but was deeply worried.
