Is Aoi Sekai no Chuushin de hentai?
English title: World War Blue
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

TV Special · 2012 · 3 episodes · R+ - Mild Nudity
Action, Adventure, Comedy, Ecchi, Fantasy, Parody, Shounen
Segua Kingdom has been losing the war against Ninterdo Empire but the tables are turned by the appearance of a boy called Gear. All the characters are parodies of Nintendo or Sega games such as Sonic the Hedgehog, Super Mario Bros., The Legend of Zelda etc.
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