Pro-wrestler Shibata Genzo who's maniac pet animals suddenly was summoned to a different world. Genzo was asked by the princess to get rid of the evil beasts called monsters roaming in this world. Outraged that he was asked to kill monsters, he German suplexed the princess. Unable to get back to earth, he decided to live a slow peaceful life in this world. This is a story about an eccentric Japanese man who was a former pro wrestler and manages a "Monster Pet" shop.

Note: The volume and magazine chapters use different numbering schemes as they combine some magazine chapters into one volume chapter.