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Brain awakens and finds himself kidnapped by an evil organization named Mu, whose primary aim is global conquest. Chosen for his high IQ, his body was rebuilt and he was about to be brainwashed when the process is interrupted.
Shota Matsushima
Brain / Kamen Rider Brain
Tomoya Warabino
Heart
Fumika Baba
Medic
Chris Peppler
Crystal Peppler
Tomokazu Seki
Oogumo Great Leader (voice)
Yu Inaba
Go Shijima