Is Shuiro no Kamen hentai?
English title: The Vermilion Mask
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

TV · 2026 · R - 17+ (violence & profanity)
Action, Fantasy, Seinen
The mask brings calamity. The mask revels in slaughter. The mask has a will of its own... Peru, a traveling mask merchant, possesses the ability to craft mysterious masks that give its wearers unique powers. In a city shrouded in an eerie atmosphere, he encounters Sonah, a mysterious young girl. As revelations unfold and inner conflicts arise, a young boy takes his first steps forward! Immerse yourself in a thrilling mask battle fantasy! (Source: Orange Inc.)
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