Manga The series is written and illustrated by
Naoshi Arakawa. It was serialized in
Kodansha's
Magazine E-no from June 20, 2009, to August 20, 2010. Its chapters were compiled into two
tankōbon volumes.
Kodansha USA is publishing the series digitally and in print.
Volumes Film An
anime film adaptation of the series, titled , was announced in September 2020. The film is animated by
Liden Films and directed by Seiki Takuno, with
Natsuko Takahashi writing the script, and
Masaru Yokoyama composing the music. It was originally set to premiere on April 1, 2021, but it was delayed to June 11, 2021. The staff said it was due to "unforeseen circumstances", but they also expressed hope of the
new coronavirus getting contained.
Crunchyroll streamed the film outside of Asia. In Southeast Asia,
Muse Communication licensed the film. ==Reception==