Is Terror Man hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

ONA · 2026 · 8 episodes · PG-13 - Teens 13 or older
Action, Supernatural
Min Jung Woo has a special ability, one that lets him see whenever a path leads to an unfortunate future. Min Jung Woo uses his eyes of "Misfortune" to spot unfortunate events and tries to stop them, leading him to become a terrorist feared by the people.
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