That JAV

Kana and Masato have been married for four years. They are beginning to see parts of each other that they could not see before, and their quarrels over trivial matters are increasing.... Then, Kana is invited to the home of Tsubasa, a classmate from her school days whom she met again at a class reunion. Tsubasa, who had been plain and unassuming during their school days, has become beautiful... Soon after, Kana and Masato are invited to Tsubasa's house with her husband and wife, and hear that the secret of their happy marriage is to exchange spouses...