Is K-On!!: Ura-On!! hentai?
English title: K-ON!!: Ura-On!!
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.
Special · 2010 · 9 episodes · G - All Ages
Comedy
Extra short anime "Ura-On!!" included in the limited edition of the K-ON!! Blu-ray.
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