Shiawase Sou no Okojo-san

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....

Yoshiko Hanabatake is an idiot beyond all belief. Somehow managing to consistently score zeroes on all of her tests and consumed by an absurd obsession with bananas, her senseless acts have caused even her own mother to lose all hope. Only one person is up to the task of keeping her insanity in check: childhood friend Akuru "A-kun" Akutsu. Though he bemoans the ridiculous behavior he has to endure, the studious but terrifying A-kun is always ready to put an end to any stupidity Yoshiko gets up to, with no qualms about using physical force. Unfortunately, no matter how many times he attempts to knock some sense into her, the girl bounces right back to her usual shenanigans, even dragging in some other eccentrics along for the ride. Try as he might to rein in her nonsense, every moment is unpredictable with Yoshiko and her profound idiocy on the loose.

The first time he saw her, it was love at first sight. Unfortunately for Sorata Kanda, "she" was a cat named Hikari and his school's rules forbid keeping pets in the regular dorms. As a result, Sorata is banished to the infamous Sakura Hall alongside other troublesome and unusual students like Jin, overzealous playboy, Ryuunosuke, the reclusive hermit, and Mashiro, a brilliant artist who's so unfocused and clueless about the real world that dorm supervisor Ms. Sengoku assigns Sorata the task of taking care of her along with his ever-growing collection of stray cats!

The manga centers on Mitsutaka Oji, a 40-year-old man who by all appearances is attractive and cool and is excellent at his job. However, he has a secret: he absolutely loves small and cute things. The comedy manga follows his everyday life.