I mistaken my sleeping mother-in-law's ass for my wife's ass and immediately inserted it without knowing it as my mother-in-law. Kimishima Mio

The movie revolves around a husband who mistakenly has relations with his sleeping mother-in-law, thinking she is his wife. This mix-up creates a complex and potentially volatile situation within the family dynamics, particularly considering the relationships between the husband, his wife, and his mother-in-law. The central dramatic tension arises from the consequences of this mistake and how it affects the characters involved.