Four Leaf Ring

 is sung by Tamaki Yotsuba's voice actor, KENN. The song lyrics are written by and the song's arrangement and composition is by.

 is part of the 12 SONGS GIFT project where, in 2018, all 12 idols from IDOLiSH7, TRIGGER, and Re:vale will be releasing solo songs on their birthdays.

 can be purchased digitally on the iTunes Store, animelo mix, music.jp, mora, and Recochoku (レコチョク).  was also released within the game on April 1, 2018, Tamaki Yotsuba's birthday. If you clear Part 1 Chapter 1.6 it will be available within the normal lives.

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