Is Muumindani no Suisei hentai?
English title: Comet in Moominland
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

Movie · 1992 · 1 episodes · G - All Ages
Adventure, Fantasy, Kids, Slice of Life
Unusual things have been happening in Moominvalley. Moomin, Sniff and Mee leave for the Observatory on the Lonely Mountains to confirm the Muskrat's words: a comet is about to hit Moominvalley and destroy everything. On the way they meet Snufkin, the Hemulen and the Snorks and experience many adventures. (Source: ANN)
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