Progressive -Zan Shin-

progressive -zenshin- (progressive -漸進- lit. progressive -gradual progress-) is a character song that is performed by the Naegi siblings Makoto Naegi (voiced by Megumi Ogata) and Komaru Naegi (voiced by Aya Uchida). It also serves as the ending theme of Danganronpa Another Episode: Ultra Despair Girls.

It was released on January 28th, 2015 in a single of the same name along with poison -gekiyaku-.

In the English release of the game, the song title is written as "Progressive -Zan Shin-" in the credits roll.

On 12th April, 2017, a remastered version of the album was released. This change consisted mainly of a higher resolution of both songs.