The "Hentai" Prince and the Stony Cat.

The "Hentai" Prince and the Stony Cat (Japanese: 変態王子と笑わない猫。, Hepburn: Hentai Ōji to Warawanai Neko.), also known as HenNeko (変猫。) or Towanai (とわない), is a Japanese light novel series written by Sō Sagara and illustrated by Kantoku. The story revolves around Yōto Yokodera, a high school student who struggles to express his true feelings, and Tsukiko Tsutsukakushi, a girl who wishes to not show her emotions easily. After making wishes at a mysterious stone cat statue, Yōto becomes unable to lie, while Tsukiko loses all her emotions. To revert these changes, they embark on a quest to find the person who received their traits, leading to a series of comedic and fantastical events. The series is known for its unique premise, engaging characters, and lighthearted comedy, and has been adapted into manga and anime.