Maki became immensely strong after Mai’s death because her Heavenly Restriction (a special condition like Toji Fushiguro’s) finally reached its full power, once all cursed energy between the twins was removed from the world.

How Twins Work in Jujutsu

In the jujutsu world, identical twins are treated as a single entity by the system. Because of this:

  • Mai was born with a cursed technique (Construction), but very little cursed energy of her own.
  • Maki has a Heavenly Restriction (like Toji), which normally gives godlike physical stats but means she can’t use cursed energy at all.
  • While both were alive, Maki’s tiny amount of cursed energy (probably “borrowed” from Mai, due to the twin bond) prevented her Heavenly Restriction from activating fully.

So before Mai died, Maki was strong but still limited; she was nowhere near Toji-level.

What Mai Did with Her Last Moments

When both sisters were facing death in the construction pit, Mai realized what had to be done:

  • She used up all her cursed energy and cursed technique to create a special sword (a blue, cursed-tool-like weapon) for Maki.
  • In doing so, she pushed herself beyond her limit and died, taking all existing cursed energy shared between the twins with her.
  • Her final words were essentially: “Now that I’m gone, you’ll have zero cursed energy, and your Heavenly Restriction can finally go all out”.

By sacrificing herself, Mai completed Maki’s Heavenly Restriction, turning her into a true “human weapon” with no cursed energy left to hold her back.

How Maki’s Power Changed

After Mai’s death, Maki’s body and abilities underwent a massive transformation:

  • Superhuman physical stats : Her strength, speed, and durability jumped to levels comparable to Toji Fushiguro, letting her overpower even elite sorcerers and executioners in hand‑to‑hand combat.
  • No cursed energy : She now has truly zero cursed energy, which makes her immune to detection via cursed energy and lets her move without a “sorcerer signature”.
  • “Body of steel” : Her Heavenly Restriction now grants her a reinforced body that can shrug off powerful cursed techniques, survive brutal injuries, and regenerate quickly.
  • Fighting the Zenin clan : With this new power, she easily slaughtered her entire clan in a single night, killing her father and dozens of elite fighters in a sword duel.

Why She Wasn’t Stronger Before

Before Mai died, Maki’s Heavenly Restriction was “incomplete” because that tiny bit of cursed energy kept it capped. In effect:

  • She was physically gifted, but not on the same level as Toji.
  • She struggled against stronger Zenin clan members and needed tools and training just to survive.
  • Only after Mai’s death did she unlock her true potential and become a “demon” of pure physical strength.

So, Mai’s sacrifice wasn’t just emotional — it was the key that finally unlocked Maki’s ultimate power and turned her into one of the strongest fighters in the series.

Information gathered from public forums and data available on the internet and portrayed here.