The short features Yuuki Wakai, a member of the idol group i ☆ Ris, and Kei Kobayashi. Wakai also composed the soundtrack for this short, and wrote, composed, and sang the theme song "Promise."
The anime Kanojo wa Utau, Dakara Boku wa was produced remotely, with Avex technology credited with production. Nobukazu Sakai (ef: a tale of memories), a producer best known for his work at developer company Minori, directed and wrote the scripts for this short film, with Kazuharu Kina handling character design.
On the other hand, the AniCast Lab tool allows users to create anime through the use of virtual reality, much like the one used by Virtual YouTubers. AniCast uses the Oculus Rift and Oculus Touch devices to operate and capture motion to create 3DCG animated characters using the movements of a real person. Users can also operate the camera freely, place objects, and change scenarios.
Sources: Anicast Lab's YouTube channel, i☆Ris' website, Animate Times
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