“Shinjiro” will live with his mother-in-law and grandmother-in-law at this wife’s parents’ house.

For some reason, he ends up having a relationship with his “grandmother-in-law Yoshiko” and “mother-in-law Yoshino”.

What will happen to their cohabitation? Will he continue to have an illicit relationship with one of them, or will he have a relationship with both of them at the same time?

Thus began the tumultuous days of Shinjiro.

[From official site]