The seventeenth Diamond is Unbreakable episode follows Rohan Kishibe and Koichi into a ghost alley missing from Morioh's maps. There they meet the spirit Reimi Sugimoto, who reveals a hidden serial killer stalking the town and points the heroes toward Yoshikage Kira.
Recovered from his beating by Josuke, Rohan recruits Koichi to help him explore a strange alley absent from every map of Morioh, drawn to it after reading Koichi's memories. Inside, each corner returns them to the same street and its mailbox, and a girl named Reimi Sugimoto approaches. Suspecting a Stand user, Rohan uses Heaven's Door on her, but she proves to be an ordinary person as he reads far into her private history, earning Koichi's rebuke. When Reimi begins a ghost story, a dog with a slit throat joins her, and she reveals that both she and her pet Arnold are spirits, and that the alley is a limbo between the living world and Heaven.
Reimi explains that the man who killed her has gone on secretly murdering others and begs the pair to stop him, then guides them toward the exit with a warning not to glance back too soon, lest dark spirits drag them into the afterlife. Near the way out, those spirits trick a panicked Koichi, something they have never dared attempt with Reimi, and Rohan uses Heaven's Door to pull them both to safety. Rohan later meets an old monk at Reimi's grave who was once her friend and was spared the same fate. When Koichi reports the murders, Josuke doubts they can act against an ordinary man, and the episode closes on that killer, Yoshikage Kira, calmly conversing with a severed hand about his inherited family home.

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The adaptation fully visualizes Heaven's Door touching Reimi, adds more imagery to her murder, and gives her school as Budogaoka High. The Kira reveal is shifted to play over the closing credits rather than the usual ending song. Director Naokatsu Tsuda noted that the alley used a deliberately unusual color palette to convey its otherworldly feel, and that Rohan's outfit would change with every appearance from this point onward.
Rohan meets a girl named Reimi Sugimoto in an alley missing from Morioh's maps, who turns out to be a spirit accompanied by her dog Arnold, also a ghost.
When Rohan uses Heaven's Door on Reimi suspecting she is a Stand user, he instead reads deep into her private history and confirms she is an ordinary person, earning a rebuke from Koichi.
Reimi warns Rohan and Koichi not to glance back too soon as they leave the alley, since dark spirits could drag them into the afterlife if they do.
The episode closes on Reimi's killer, Yoshikage Kira, calmly conversing with a severed hand about his inherited family home, confirming he has continued murdering in secret.
When Koichi reports the ongoing murders to Josuke, Josuke doubts that they can act against what appears to be an ordinary man.
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View on FandomThis content is original writing by Daddy Jim Headquarters based on the JoJo's Bizarre Adventure anime series, manga, and official materials. JoJo's Bizarre Adventure was created by Hirohiko Araki, published by Shueisha, and animated by David Production. All rights to JoJo's Bizarre Adventure and its characters belong to their respective owners. Episode and chapter references are cited where applicable.
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