Tamachen!! 

Komachi Himeno is a cute and busy girl in school. Onigawara Nozomi has a monster-like face and monster-like strength. Everyone in class is afraid of Nozomi, but Himeno bravely chooses him as part of the cleaning group. That day, on her way home, Himeno notices that Nozomi is chasing her. Scared, she runs away and they both end up falling down some stairs. Afterwards they realize that their souls have swapped.....