Boku no Kanojo wa Gatenkei/Kanojo ga Shita Koto, Boku ga Sareta Koto/Kyonyuu Tsuma Kanzen Hokaku Keikaku/Boku no Tsuma ga Aitsu ni Netoraremashita.

The year of 2012, late autumn. Tanaka Masashi, an architect, and Tanaka Misaki, a beautician, are in their third year of marriage. Masashi is invited with his wife on a friendship trip to an onsen by Aida, an executive director of the construction company, a frequent business partner of Masashi