Kaiketsu Mystery

 (解決ミステリー, Kaiketsu Misuterii) is sung by Fly away's voice actors, Fly away's voice actors, Toshiki Masuda as Iori Izumi and Kensho Ono  as Riku Nanase. The song lyrics are written by, and the song is composed by.

 was originally released within the game on March 27, 2019 as the second song of Part 4. If you clear Part 4 Chapter 4.3, it will be available to play within the normal lives. The full version of  was released on September 27, 2019, and can be purchased digitally on the iTunes Store, animelo mix, music.jp, mora, and Recochoku (レコチョク).

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