[3] On March 7, 2019, the official website of Sarazanmai announced that Kana-Boon would be performing the opening theme song for the anime series.

The song was written by Kana-Boon's singer and guitarist Maguro Taniguchi specifically for the show.

The song was also written as part of the band's fifth anniversary of debuting under a major label.

[3] The promotional video, animated by MAPPA, was released on June 5, 2019, with Taniguchi commenting that he was excited as the video looked like an anime opening, and he was looking forward to playing the game.

[10] The music video for "Massara" was released on June 12, 2019, and is directed by Satoshi Watanabe.