Is Tobira wo Akete (1995) hentai?
English title: Open the Door
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

OVA · 1995 · 1 episodes · G - All Ages
Avant Garde, Fantasy
It's bedtime, and Nonoko is about to go to sleep. But the play of light and shadow on those objects on the wall look almost like... a person. (Source: ANN)
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