The "Hentai" Prince and the Stony Cat (Japanese: 変態王子と笑わない猫。, Hepburn: Hentai Ōji to Warawanai Neko., "The Pervert Prince and the Unsmiling Cat"), also known by the shorthand HenNeko (変猫。)[1] and Towanai (とわない),[2] is a Japanese light novel series written by Sou Sagara and illustrated by Kantoku.

One day, his equally perverted best friend completely transforms and gets rid of his "impure thoughts"; a feat he attributes to the power of the statue of the "Stony Cat".

After realizing that they do not like the change that happened, they work together to try to find out who has received their trait that was taken away in order to get it back.

The "Hentai" Prince and the Stony Cat is a light novel series written by Sou Sagara, with illustrations by Kantoku.

[23] A 12-episode anime television series adaptation produced by J.C.Staff, written by Michiko Itou, and directed by Yōhei Suzuki aired between April 13[31] and June 29, 2013.

[33] The anime is licensed by Sentai Filmworks in North America, and it was released digitally and on home video on June 3, 2014.