Is Sword Art Online: Alicization - War of Underworld Reflection hentai?
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

TV Special · 2019 · 1 episodes · R - 17+ (violence & profanity)
Action, Adventure, Fantasy, Video Game
Recap of Sword Art Online: Alicization, aired one week before Sword Art Online: Alicization - War of Underworld.
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