Protocol: Rain - Season 1 Episode 4 A Promise That Connects: 3 Way Handshaking
- Genre: Animation, Comedy, Drama
- Studio: HTB, tv asahi, Nagoya TV, Kyushu Asahi Broadcasting, ABC TV, NCC, Oita Asahi Broadcasting, Asahi Broadcasting Aomori, Niigata Television Network 21, khb, KFB, HOME, KSB, Kagoshima Broadcasting, Iwate Asahi TV, Akita Asahi Broadcasting, Yamagata Television System, Shizuoka Asahi TV, Asahi Broadcasting Nagano, Hokuriku Asahi Broadcasting, Ehime Asahi TV, Yamaguchi Asahi Broadcasting, Kumamoto Asahi Broadcasting, Ryu-Q Asahi Broadcasting
- Keyword: esports, anime
- Cast: Kensho Ono, Sora Amamiya, Inori Minase, Momo Asakura, Ryohei Kimura, Tomokazu Sugita
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