PetoPeto-san is a tV series anime that premiered in summer 2005, produced by Xebec.

About the production: the story comes from a light novel, there are 13 episodes of about 25 minutes and its current status is "finished".

Its main genres are comedy, fantasy and romance, with themes such as Youkai, School and Love Triangle.

On AniList, PetoPeto-san has an average score of 60%, an average score, and appears on 2,039 users' lists.

In a Japan not quite like our own, the "youkai" (supernatural creatures) have started living together with humans. Now, in an ordinary school, all sorts of "monsters" attend regular classes. A human boy, Oohashi Shingo, finds himself attracted to one of these creatures, a "petopeto" called Fujimura Hatoko. Petoko, as she is called, is a minor monster, with only the power to stick to something she adores. Like Shingo.... (Source: Anime News Network)

Official synopsis from AniList.