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

Special · 2009 · 7 episodes · PG-13 - Teens 13 or older
Comedy
Special omake episodes from the Blu-Ray releases, showing the heroines and foes in funny, uncommon situations.
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