Is Full Moon wo Sagashite: Kawaii Kawaii Daibouken hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

Special · 2002 · 1 episodes · G - All Ages
Comedy, Shoujo, Supernatural
Mitsuki wakes up late, and must rush to a photo shoot. However, in her hurry she forgets to bring Takuto and Meroko along. Now they must catch up to her, before the photo shoot begins, despite everything that gets in their way. (Source: ANN)
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