Manga artist Sui Ishida (most famous for his work on manga series "Tokyo Ghoul" and "Choujin X") was responsible for the game's lyrics, character designs, in-game illustrations, and helped work on the worldbuilding. He decided to personally write the game's lyrics because he wanted the character's songs to better reflect them. To that end, he convinced composer Akira Kosemura to work on the game after being inspired by his songs.