Is Hoshi wo Katta Hi hentai?
English title: The Day I Bought a Star
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

Movie · 2006 · 1 episodes · G - All Ages
Kids, Sci-Fi
A young boy, tired of the city, escapes into the country. When trying to bring vegetables to the market to sell, his cart breaks down and he exchanges the vegetables for a mystical seed. Returning home he plants the seed in a normal pot—only to find it growing into a planet. (Source: ANN)
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