Is Gintama on Theater 2D: Kintama-hen hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Movie · 2024 · 1 episodes · PG-13 - Teens 13 or older
Action, Comedy, Gag Humor, Historical, Parody, Samurai, Sci-Fi, Shounen
A compilation film of the Kintama Arc, episodes 1–4 in the third season, featuring additional footage. The movie is a part of the "Gintama 20th Anniversary Project."
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