Is Penguin's Memory: Shiawase Monogatari hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Movie · 1985 · 1 episodes · PG-13 - Teens 13 or older
Anthropomorphic, Drama, Military
Mike is a penguin soldier who returns home after being injured during combat. Estranged from his family and friends, he leaves his hometown and starts to roam adrift through the country. (Source: ANN)
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