Is Narutaru: Mukuro Naru Hoshi Tama Taru Ko hentai?
English title: Shadow Star Narutaru
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

TV · 2003 · 13 episodes · R - 17+ (violence & profanity)
Drama, Horror, Sci-Fi, Seinen, Suspense
During her summer holiday at her grandparents house Tamai Shiina, a young and cheerful schoolgirl, meets a strange looking creature. They befriend each other and Shiina names it "Hoshimaru: The Round Star." When Shiina returns home after the summer to go back to school, she starts meeting other kids that also have befriended a strange creature like Hoshimaru. But she soon finds out that not all these creatures and their masters are as friendly as Hoshimaru. (Source: ANN)
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