Based on the Manga ''Furumuun wo sagashite'' by Arina Tanemura.
This is Arina Tanemuras second Manga that has been turned into an Anime. The first was ''Kamikaze Kaito Jeanne''.
Most of her Manga series have been published in the very popular Ribon Magazine.
Arina Tanemura is one of the most popular Mangakas in Japan.