Is Bleach: The Sealed Sword Frenzy hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2006 · 1 episodes · PG-13 - Teens 13 or older
Action, Adventure, Shounen, Supernatural
A Shinigami named Baishin who was sealed by Soul Society long ago is set free on Earth. On a fateful day Ichigo encounters him and has roughly half of his reiatsu drained. Its now up to Ichigo and the Soul Society to finally put a stop to Baishin and his destruction.
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