Mayoi Neko Overrun! is a Japanese light novel series by Tomohiro Matsu, with illustrations by Peco. Twelve volumes have been published by Shueisha under their Super Dash Bunko imprint. "Mayoi Neko" translates as "Stray Cats", referring the name of the cafe around which the story develops, and alluding to the orphans and other "stray" characters who collect there. It is also the name of a school club for helping people in the story.