Oni ga Deru ka Ja ga Deru ka

is a japanese manga series written by Advenchara. It began serialisation in the August 2014 issue of Manga Time Kirara Forward.

The series was released under 5 volumes from January 2015 to June 2017.

Synopsis
When our hero, Matsubara Yuu, suddenly finds himself moving back to his mother’s home, a number of strange things happen to him. He meets Suzu, a beautiful girl who falls in love with him at once, even wanting to have his children. Even if he wanted to run away from the situation, his way was blocked by a huge cow attacking him. In fact, in all of these, he seems to be the cause…

(Source: MU)