Years into their marriage, the Kajiuras finally try to have a child only to find that they can’t. Knowing that things can’t continue on like this, he decides to do some research and comes across a relationship seminar. After successfully cajoling his wife Risa into attending and hearing the lecturers’ speeches, even she comes around to thinking that this may work.

When they meet the Sonodas at one of the seminar’s group sessions, the Kajiuras find themselves opening up to them about their problems and become close enough to start hanging out outside of the seminar.

However, a session weeks in where the two couples go on a double date puts them all on the path to doing it more and more.