You can see manhole cover designs based on the Masked Rider series
Aired from 1971, the Masked Rider TV series features Takeshi Hongo, who was abducted by Shocker, a mysterious worldwide terror group that had planned to create a cyborg. In the story, Takeshi gains super powers before he escapes. He transforms into the Masked Rider and fights Shocker. Toei has made many episodes of the Masked Rider series since 1971. This manhole cover's motif features Masked Rider 1.