Is Kyoto Animation: Sora-hen hentai?
English title: Sky
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

CM · 2010 · 1 episodes · G - All Ages
Slice of Life
High above a lush countryside, a group of young children are soaring through the sky. Equipped with jetpacks, they joyfully zip around the atmosphere, leaving trails of smoke in their wake. [Written by MAL Rewrite]
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