Is Mouryou no Hako: Chuuzenji Atsuko no Jikenbo - Hako no Yurei no Koto hentai?
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

Special · 2009 · 1 episodes · R - 17+ (violence & profanity)
Historical, Mystery, Supernatural, Suspense
A side story that reveals the investigative notes that Atsuko, the younger sister of the main character Akihiko Chuzenji, wrote about the brutal dismembering incidents in the main story. (Source: ANN)
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