Is Rozen Maiden: Meitantei Kunkun - Duell Walzer hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2006 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Mystery
Extra animation from the PS2 game. 7-minutes skit of an 'actual Kunkun episode' from the Rozen Maiden series.
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