Kenji, a humble office worker suffering from ED, has a completely cold relationship with his wife, Mao. One day, he happens to run into his neighbor, Nakata, at a park and learns that Nakata is currently unemployed and has been abandoned by his family. Kenji invites Nakata over for a meal with his wife, but seeing Nakata attracted to the beautiful Mao, he begins to be driven by a "cuckold desire"...