Is .hack//Quantum hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.
OVA · 2011 · 3 episodes · PG-13 - Teens 13 or older
Action, Adventure, Fantasy, Video Game
Tobias, Mary, and Sakuya challenge the impregnable "The One Sin", but they lose their way in the maze and unintentionally trap other guild members. A mysterious cat is watching their blunder. Is it another player character or NPC?
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