 On August 27, 2014, SID's Enamel was released and it was used for the opening title in "".On May 13, 2017, SID created the new song "Rasen no Yume" (Spiral Dream) for the anime adaptation of "".The song's CD single will go on sale on August 2, 2017 in three versions (a limited first pressing with a DVD, a standard edition, and a limited standard pressing with an anime illustration).