Shin-Ei Animation
is a Japanese children's novel series written by Hiroshi Ishizaki and illustrated by Kaori Fujita. The series was launched on Kodansha's "Aoi Tori Bunko" imprint between July 2005 and February 2012, releasing 15 volumes during its run. An anime television adaptation by Shin-Ei Animation was broadcast in Japan from April 4, 2012 to February 19, 2014.