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: Anime News Network)
Genres: Mystery, Supernatural, Thriller
Watch Mouryou no Hako Special episode 1 online — subbed and dubbed, with automatic AniList / MyAnimeList progress sync.