The anime is part of the "Zutto Ōen Project 2011 + 10...", commemorating the 10th anniversary of the 2011 Tōhoku earthquake and tsunami.

"[4] Yui and Hiyori meet the elderly and kind Kiwa in a shelter following the devastating Tōhoku tsunami on March 11, 2011.

Kiwa gets in touch with kindly kappa, zashiki warashi, komainu, and ojizōsama (among others) and together the characters confront and defeat demons that feed on people's grief after the disaster.

[9] David Production produces the film, with direction by Shinya Kawatsura, screenplay written by Reiko Yoshida[1] and music composed by Yuri Miyauchi.

[11] The closing theme is performed by Hitsujibungaku (羊文学) with the song Mayoiga from the album our hope Eleven Arts announced at their panel at the A-Kon event on June 4, 2022 that they have licensed the film and will bring both an original Japanese version and a new English dub for the North American theatrical release in partnership with AX Cinema Nights on September 7.