The ending theme "Douse Shinundakara" was composed by Tanaka and arranged by Murase. The lyrics—which used the game's constructed language—were written by Toyama, while the theme was sung by Masako Toda. Toyama wrote the lyrics based on a portion of the game's script which saw Kat transported through an introspective vision about her past. At the time of writing, production was not going smoothly and Toyama was feeling frustrated and more conscious of death in the wake of a severe earthquake in Japan in 2011. Realizing that death was inevitable and that people should enjoy the moment, Toyama wrote the lyrics to imply this message. Toyama was worried during the recording process due to the lyrics being fictional, but Tanaka advised Toda to sing the song as if she were humming a tune in a bar.