Itoshi no Betty Mamonogatari

Mononoke is a spin-off of the Bakeneko story arc of Ayakashi: Japanese Classic Horror. It follows the Medicine Seller as he deals with various spirits or "Mononoke" in feudal Japan. Just like in the Bakeneko story, he combats with a series of tools and his vast knowledge of the supernatural on his side, but can only slay the Mononoke when he uncovers its form (Katachi), the truth behind its appearance (Makoto) and the reason for its unusual behavior (Kotowari).

A race of cannibal monsters called the Shokujinki exists and it is the job of the Kifuuken, an elite group of beast-hunters, to stop them. Toshihiko Momota, an expert swordsman and son of the Kifuuken organization's leader, unexpectedly falls in love at first sight with a beautiful girl named Yuka. However, the couple's relationship is much more complicated than it seems at first glance, for Yuka is a Shokujinki.

Makoto Niwa just moved to the city to live with his aunt Meme after his parents were reassigned to work overseas. He is perfectly fine with that, saying it will give him the chance to live the dream life of an adolescent boy. He keeps track of the things he does by assigning "points" to them—positive or negative—and adds them up on a regular basis to grade his adolescent life. And then he discovers Meme has a secret daughter (and self-proclaimed alien) named Erio. He finds her rolling around by the front door of Meme's house wrapped up in a futon. It is then he realizes that his dream adolescent life will not come true, and begins a life of experiences that are out of this world.

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....