Cuckold Is Inevitable!? Classroom You Can't Leave Without xx

Two people who live in an extraordinary town in an ordinary town.

Takahiro and Yumiko were born and raised in a family of exorcists.
The two are childhood friends and partners, but due to family circumstances, they become fiancée.
Even though they were aware of each other, they maintained a pure relationship until they finished their studies.

The two were tasked with protecting the town from  every day.
Following his role, he will follow the traces of the  that has recently disturbed the town.