Hatsukoi Rhythm

 (ハツコイリズム, Hatsukoi Rizumu) is sung by. The lyrics are written by and the song is composed by.

 was originally released in the game as part of Part 4. If you clear Part 4 Chapter 15.5 it will be available to play within the normal lives. The full version of the song will be released as part of the Mr.AFFECTiON Single on January 8, 2020, 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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