Is Ojamajo Doremi Na-i-sho hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

OVA · 2004 · 13 episodes · G - All Ages
Comedy, Mahou Shoujo
Na-i-sho is a 13 episode OAV series detailing the summer between the ~motto~ and the Dokkaan season. It is a bit more mature than the TV seasons, and looks to develop each of the five witches romantically. Hana is back to a baby, and the mahou shop is a bakery. (Source: ANN)
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