Petopeto-san
ぺとぺとさん
Petopeto-san is a light novel series written by Kou Kimura and illustrated by Yug. An anime adaptation aired from July 9, 2005 to October 1, 2005. The story is set in a Japanese school where everything is normal, except for students from what are called "specified races." These specified races are based on yōkai from Japanese mythology; for example, one student on the swim team is a kappa, while another, a nurikabe, merges with walls and is popular in the summertime for having a very cool temperature.
