Seigi wo Aisuru Mono Gekkou Kamen | Episode 4

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As the theme song denotes, no one knows who Gekko Kamen is. He is a lone figure dressed entirely in white, who mysteriously appears when danger is afoot. While he appears to be a regular human, he is exceptionally gifted in many areas including unarmed combat and gymnastics. He is an expert motorcycle rider and a superb marksman.(Source: AniDB)