SECRET NIGHT

 is sung by. The song lyrics are written by, and the song is composed by.

 was originally released within the game. If you clear Part 1 Chapter 4.3 it will be available within the normal lives. It was released on December 2, 2015 as the main song of the SECRET NIGHT Single, which can be purchased digitally on the iTunes Store, animelo mix, music.jp, mora, and Recochoku (レコチョク).

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