Kamen Rider (1971) : 37x3

Yuna meets Shiori, a girl whose father has gone missing in the city, and deduces that it’s the work of a Fukashigi. Sora also begins his own investigation. Tatsuomi, who had been keeping an eye on Sora, witnesses Sora transform into My-Th right in front of the Fukashigi. Seizing the moment, he pulls out his own Driver and transforms into Kamen Rider...!