Poppen-sensei to Kaerazu no Numa

The story centers around Wakaba Himeji, a fifth-grade girl who can see things others cannot. As a result, she is scared by her surroundings, keeps her distance from others, and lives a lonely life. One day, she meet a mysterious soft, pink creature that cries "Pupipo!" — and her life is changed from that day forward.

Based off of the game. Popo, and his family were harmoniously living with the insects in the forest until one day when his father left him and gave him a mysterious pendant with magical powers. Now, with mysterious events happened to his mother, he must travel with his newly found companions to the forest to solve the mysteries bound in the east.

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....

Pen-Pen, the hat-and-tie-wearing prince of Penguin Land, turns up unexpectedly on little Mika's doorstep. and invites himself and his zany friends to stay. Based on the manga by Muroyama Mayumi, serialised in Shougaku Ninensei.