Is Ryuugajou Nanana no Maizoukin: Nanana Nippon Mukashibanashi hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2014 · 6 episodes · PG-13 - Teens 13 or older
Comedy
Specials included on the Blu-ray/DVD volumes.
View on MyAnimeListShare
Check another title