[1] The series, created by Mark Hattori, is based on the supernatural beings called yōkai from Japanese folklore.

Yokai are a class of supernatural creatures that have long held a prominent place in Japanese folklore.

They are sometimes dangerous to humans since yokai are not restrained by the laws of nature and those who are not already part animal have the ability to shapeshift.

The legend goes that Ippei (Shin Koyamada) was found by his foster father in a coconut shell on a beach.

Although he was brought up as a normal boy, Ippei could see nature’s spirits, including kijimuna, invisible to human eyes.