ITSUKI SPOILER!
IT
Itsuki is a demon known as the Gatekeeper whose ability to manipulate dimensions makes him indispensable to Sensui's plan. Years earlier Sensui was supposed to kill him during a Spirit Detective case, but their conversation changed both lives. Itsuki becomes fascinated with Sensui's purity, then remains beside him as that purity fractures into something far darker. Their relationship is intimate, obsessive and intentionally difficult to categorize. Itsuki does not try to save Sensui from his descent because he wants to see every version of the person he loves, including the broken ones. During the final confrontation he uses the Reverse Man to trap Kuwabara, Kurama and Hiei in another dimension so they must watch Yusuke fight without interfering. After Sensui dies, Itsuki takes his body away to a private dimension rather than surrendering him to Spirit World.
ITSUKI THROUGH THE ARCHIVE //
CHAPTER BLACK WATCH GUIDE //
Open page →As the fight continues, Sensui stops behaving like one consistent opponent because he is not one. Kazuya emerges with a gun-like energy weapon and sadistic enjoyment very different from Shinobu's controlled presence.
Itsuki explains that Sensui's mind divided after the trauma that destroyed his old worldview. Different impulses could exist without being reconciled because different personalities carried them.
Itsuki explains that Sensui's mind divided after the trauma that destroyed his old worldview. Different impulses could exist without being reconciled because different personalities carried them.
Why it matters
Sensui's moral absolutism did not make him internally pure. It helped make him unable to hold contradiction inside one self, while Yusuke's entire personality is basically contradiction held together by loyalty.
Myth: Sensui's only goal was to wipe out humanity.
By the end, Itsuki reveals that Sensui is already dying. Opening the tunnel is still tied to his judgment of humanity, but Sensui also wants to reach Demon World before his own death.
That makes his final motive more personal and less tidy than the ideology he used to recruit others. He wants to see the world he spent years defining from the outside. He wants to die there. He has built an apocalyptic plan around a moral crisis, but he is also a terminally ill man trying to choose the place of his own ending.
That makes his final motive more personal and less tidy than the ideology he used to recruit others. He wants to see the world he spent years defining from the outside. He wants to die there. He has built an apocalyptic plan around a moral crisis, but he is also a terminally ill man trying to choose the place of his own ending.
Why it matters
The revelation does not excuse Sensui. It stops the viewer from reducing him to the slogan he used to organize everyone else.
YU YU HAKUSHO COMBAT LEDGER //
Open page →Yusuke's fight with Sensui stretches across several versions of the same opponent and eventually across worlds. It begins as a martial-arts duel between two Spirit Detectives, escalates through Sensui's personalities and Sacred Energy, ends Yusuke's life, and then resumes after Yusuke awakens with Demon World blood.
The Breakdown
Yusuke never gets the clean victory he wants. Raizen eventually takes control through their bloodline and finishes Sensui with power Yusuke cannot claim as his own. That frustration becomes the engine of Yusuke Meets the Ancestor Who Stole His Victory and the final arc. Yusuke goes to Demon World partly because winning somebody else's fight is not an answer he can live with.
