Rin, along with her husband and Kawamura, used to work at the same company. Kawamura fell in love with her from the very first meeting; however, Kenji was the one who won her heart. Disappointed, Kawamura left. A long time later, Kawamura returned to Tokyo to look for a job and was invited by Rin and Kenji to come over to their house. They allowed him to stay overnight, and being close to Rin made Kawamura lose his sanity...