Is Blue Lock: Episode Nagi - Additional Time! hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Movie · 2024 · 4 episodes · PG-13 - Teens 13 or older
Shounen, Slice of Life
A series of shorts which aired along with the release of Blue Lock: Episode Nagi. A different short was shown each week during the film's theatrical run and they were all included with the BD release.
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