Power dies because Makima kills her as part of a calculated plan to break Denji’s spirit and take control of Chainsaw Man. It happens in Chapter 81 of the manga, when Makima uses her signature ability to destroy Power instantly in front of Denji. But Power’s story doesn’t end there. She returns briefly in Chapter 91 to save Denji one last time before fading away for good, leaving behind a contract that still drives the plot in Part 2 of the series.
Makima’s Reason for Killing Power
Makima’s entire goal throughout Chainsaw Man is to bring Chainsaw Man under her control. She’s obsessed with the Chainsaw Devil’s unique ability to permanently erase the concept of any Devil it consumes. She wants to weaponize that power to create what she considers an ideal world, one without fear, death, or suffering. To do that, she needs Denji completely broken, stripped of every person he cares about, so he has nothing left except her.
Power is the last meaningful relationship Denji has. After Aki’s death, Power is the only person keeping Denji emotionally anchored. Makima knows this. She invites Power to her apartment under false pretenses, then kills her instantly using an invisible force she projects from her finger, a technique powerful enough to heavily damage even the Darkness Devil. Power doesn’t stand a chance. Makima later confirms the cruelty was intentional, telling Denji directly: “You helped me kill Power.” The implication is that by trusting Makima, by bringing Power into her orbit, Denji unknowingly set up his best friend’s death.
The psychological destruction works exactly as Makima planned. Denji goes into shock. He loses his will to fight, his sense of self, and eventually transforms into a feral, fully formed Chainsaw Man with no human consciousness driving him.
Power’s Return in Chapter 91
Power doesn’t stay gone entirely. When Pochita (the Chainsaw Devil bonded to Denji’s heart) senses that Denji is dying, he calls on the remnants of Power’s blood still inside Denji’s body. This revives Power in her true Blood Devil form, a tall, four-armed humanoid with an exposed rib cage, long horns, sharp claws, and cross-shaped pupils. She looks nothing like the blonde, sharp-toothed Fiend form fans knew from the rest of the series.
In this form, Power erupts out of Makima’s body using blood weapons, forcing Makima to her knees. She grabs Chainsaw Man and runs. What follows is a brutal, desperate escape. She fights off devil hunters who summon the Mantis Devil, which slices her side open. Zombies pour down from a rooftop. She kills them, but she’s bleeding badly, stumbling, barely holding herself together. She drags Denji’s unconscious body into an alley and crawls behind a dumpster.
This is where the scene shifts from action to something much harder to watch. Power, dying and fully aware of it, realizes why she’s fighting so hard to keep Denji alive. He was her first ever friend. She tells him as much. Denji, barely conscious, tries to push her away, saying his life is over, that nothing good will happen again, and that she won’t be part of it. Power ignores him.
The Blood Contract
Before she dies for the final time, Power explains how devil reincarnation works. Devils killed on Earth don’t disappear. They return to Hell. When they die in Hell, they’re reborn on Earth. It’s an endless cycle. But the version that comes back won’t remember anything. It won’t be “Power” anymore. It will be a new Blood Devil with no memory of Denji, no memory of their friendship, and it will likely see him as an enemy.
Knowing all of this, Power forms a contract with Denji. She gives him every last drop of her remaining blood, and in exchange, he has to promise one thing: find the reincarnated Blood Devil and befriend it. Turn it back into something like her. Make them buddies again. It’s a request that sounds simple but asks Denji to track down a hostile Devil that doesn’t know him and somehow rebuild an entire relationship from nothing.
Denji accepts. Power fades. The contract is sealed.
Why Her Death Matters to the Story
Power’s death serves two purposes in the narrative. First, it completes Makima’s strategy. By the time Power is gone, Denji has lost every meaningful connection: his father figure in Aki, his best friend in Power, and his sense of safety. He’s isolated in exactly the way Makima needs him to be. His transformation into a mindless Chainsaw Man is a direct result of this emotional collapse.
Second, Power’s final contract plants the seed for everything that follows. The promise Denji makes to her becomes one of the most important unresolved threads in the series. It gives Denji a reason to keep going after Part 1 ends, a purpose beyond survival.
The Blood Devil in Part 2
In Part 2 of the manga, Denji hasn’t forgotten his promise, but he hasn’t exactly been chasing it down either. The only time he mentions looking for the Blood Devil’s reincarnation is during a conversation with Yoru in Chapter 192. For most of Part 2, the plot pulls him in other directions.
That changes in Chapter 225, when Denji ends up in Hell. The trip isn’t motivated by his promise to Power, but the timing matters. Hell is where Devils go after dying on Earth, which means the reincarnated Blood Devil should be somewhere in that space. Fans have long expected this to be the moment the promise finally pays off. Whether the new Blood Devil remembers anything, cooperates, or attacks Denji on sight remains an open question, but the pieces are falling into place for a reunion that Power herself set up with her dying breath.