Is Andersen Douwa: Ningyohime hentai?
English title: Hans Christian Anderson's The Little Mermaid
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

Movie · 1975 · 1 episodes · G - All Ages
Fantasy, Romance
Marina, the most beautiful mermaid in the royal Merman family, is curious about the human world. One day, she sees a handsome prince on a boat. Suddenly, a storm comes up, throwing him into the sea. Marina saves her handsome prince and guides him to the shore. Marina falls deeply in love and desperately wants to become a human. Despite the hazards, she is willing to risk it all for love. (Source: ANN)
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