How did power save Denji?

Despite a seeming change of heart, Power rescues Denji by taking him and hiding in a dumpster. The two share an incredibly touching moment in which Denji tries to claim he's already lived a good enough life to die, and without Power, it won't be the same.

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Is Makima a villain?

Makima is the main antagonist of the Chainsaw Man series. Thereof, why did makima killed power? After making his wish to Makima, Denji explains that he killed Aki because people were going to die if he didn't stop his out of control friend. At the time, he thought that was the only option but now believes if he were smarter, then there may have been a better solution wherein Aki didn't have to die.

And another question, why does everyone want denjis heart?

Everyone wants the heart within Denji because Pochita (The Chainsaw Devil) possesses the ability to erase other devils from existence. Many of humanity's darkest moments have already been erased by the Chainsaw Devil, and Makima wants to control this power to steer human history into her own direction. How old is Makima? Makima as a young woman is especially desirable for males, capturing the attention of Denji as well. She is certainly beautiful but doesn't care much about dating. Her adult form has the age of around 23, but such a thing wasn't confirmed.

How strong is kishibe?

Enhanced Strength: Kishibe is extremely strong for a human; he was able to pick Denji and Power up off the ground with one arm each and snap their necks with neither of them being able to stop him. With simple punches he could break weapons formed out of Power's hardened blood. Who is the most powerful in Chainsaw Man? 1. Denji. Denji is the main protagonist of the Chainsaw Man series and is the strongest out of all these characters, even Makima. Denji possesses the Devil that even can erase any Devil it eats from existence (Chapter 84).