Included with the first-press edition of the game on PC. Includes the full chorus version of the OP as well as the BGM used in the game.

Theme Song
"a heart toward summer"
Lyricist: Yoshino Kawamura
Composer: Moriji Fujiwara
Arranger: Seiji Hirabayashi
Vocals: Saori Yukito
Production: BraveHearts

BGM
Aruna Ryuki (LC:AZE)
KEIGO KANZAKI (LC:AZE)