Currently available on 2 streaming services.

Protocol: Rain - watch online: stream, buy or rent

Currently you are able to watch "Protocol: Rain" streaming on Crunchyroll Amazon Channel or buy it as download on Apple TV.

Cast

Kensho Ono
Shun Tokinoya (voice)
Sora Amamiya
Yu Saegusa (voice)
Inori Minase
Nozomi Inazuki (voice)
Momo Asakura
Mio Tokinoya (voice)
Ryohei Kimura
Akito Sendo (voice)
Tomokazu Sugita
Ryusei Nagamine (voice)
Yoshitsugu Matsuoka
Mutsuki Naito (voice)
Kaede Hondo
Seshiru Sato (voice)
Azumi Waki
Emiko Takanashi (voice)