Is Sword Art Online Alternative: Gun Gale Online - Refrain hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV Special · 2018 · 1 episodes · PG-13 - Teens 13 or older
Action, Military, Video Game
Following the conclusion of the first ever Squad Jam, Pitohui is eager to see what she missed, dying to know how everything went down. To satiate her desires, M reviews footage of the competition with her, commentating on the trials that he and LLENN faced together. [Written by MAL Rewrite]
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