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

ONA · 2020 · 1 episodes · PG-13 - Teens 13 or older
Action, Fantasy
An animated short for the Arknights smartphone game's 1-year anniversary. (Source: ANN)
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