ATID-556 Find strange feelings with your best friend and his wife

Takahiro and Tsubaki have been married for two years. We started seeing parts of each other that we couldn't see, and our fights over trivial things became more and more frequent. After hearing Tsubaki's complaints, her colleague Mitsuki invites Takahiro and the Tsubaki couple to her house and offers to swap couples for the weekend only...