Unable to even comprehend what had just happened, Yoru could only watch as Pochita began to consume her sister.
Consumed by a white-hot rage now, Yoru screamed Chainsaw Man's name as the hero of hell prepared to finish the war.
Flicking her fingers forward, Yoru launched a hail of bullets, but Pochita moved like a beam of light, evading every shot. She tried to predict where he would land with a final bang, but he countered with a bone-shattering kick that sent her crashing through a nearby building.
Undeterred, Yoru got to her feet and summoned the Moray Eel Devil to ensnare him. The creature shot down from above, but before it got even within a football field of Pochita, it was sliced to shreds.
Standing upon the inverted floor of doorways, Yoru announced that before everything, the two of them had stood alone. But she had changed since coming to Earth. She had learned the true weight of bonds, and had come to value the sublimity of devils.
In a moment akin to the ancient battle in which the hero of hell fought against waves of undying devils, Yoru called forth a massive army of devils to swarm Pochita.
Launching in from where he stood, Pochita tore through her comrades in a whirlwind of gore, all while directing himself towards where the War Devil was standing.
Watching him slowly begin to be halted by the endless mass of her so-called devil family, Yoru asked him whether he was starting to understand that what he lacked was the power of bonds.
Clutching up, Pochita thrust his chainsaws through all of the advancing devils before jumping up and erupting through an even larger group.
Faced with the hero of hell's unstoppable advance, Yoru gritted her teeth as she called for her newest, most horrific creation. The Michigan Sword.
At exactly 11:23 in the morning, the entire state of Michigan collapsed in on itself as the people of Michigan plummeted down towards the earth. The state's very infrastructure was thrust skyward, buildings and steel smashing together in midair to forge a weapon of unimaginable scale.
Having already spent the entire state of Michigan, Yoru then summoned the Oregon Sword. The trapped citizens of Oregon were violently expelled from the compressed mass of their state, falling through the sky and crashing into the ocean below. In an instant, the sword travelled across the globe and cleaved Pochita vertically in half on its way to Yoru.
Knitting himself back together almost instantly, the chainsaw devil caught Yoru by surprise as he slammed down on her with all four of his blades.
Frustrated and breathless, Yoru demanded to know what Pochita had eaten to grant him such unnatural resilience.
To end the stalemate, she made another horrific sacrifice. This time she demanded that the people of Oregon give her their strength. Without rhyme or reason, the remaining citizens popped out of existence to fuel her power, and Yoru channelled the stolen life into a devastating technique, the Oregon Slash.
Even that was not enough.
Declaring that this was the end of the line, she reached across the map once more, this time sacrificing the people of Virginia to ignite her ultimate weapon. The nuclear punch.
The surrounding devils watched in paralysed awe as Yoru connected with the face of Pochita. Below her, the citizens of Japan remained blissfully unaware as the sky all around them turned to fire.
Instantaneously, the blast engulfed the entire city, sending out a shock wave so violent that it threatened to shatter the very doors of hell themselves.
In the wake of the blast, Yoru's charred head began to knit itself back together. She landed gracefully among the ruins just as the head of another devil thudded onto the scorched earth beside her. Realising what she had done, Yoru apologised, and then surveyed the nightmare she had created.
The citizens of Japan were broken, burnt to cinders, or mutilated beyond recognition. But because death had been erased, they continued to squirm in agony. They could not die.
Yoru watched as a woman with a shattered skull begged for salvation, and the realisation hit her. This was her utopia. This world was truly a dream come true.
She wept with joy, but the moment was interrupted when that same dying woman dragged herself over to Chainsaw Man and poured her own blood into his mouth to revive him.
Walking up behind the woman, Yoru ended the interference by kicking her head clean off.
With victory in her grasp, Yoru looked down on the smoking corpse of Chainsaw Man and prepared to claim her prize. She thanked him for creating such a wonderful world, and told him that because the loser belonged to the winner, she would now take him as her newest weapon.
She reached out her hand to touch the corpse, ready to name the ultimate weapon, when a human hand poked its way out from inside.
Confused, Yoru watched Denji's face appear in the Chainsaw Man mask, claiming with a cheeky grin that he had won.
Reeling back, Yoru demanded to know what he was talking about. Denji let her know that she had played paper and he had played scissors.
By winning a literal game of rock, paper, scissors, he had blocked her ability to claim him. In his mind, and therefore in hers as well, she had perceived herself as losing.
Infuriated by the sheer stupidity of it, Yoru tried to shoot him, but Denji was already moving. He tore down on his rip cord, starting his transformation into something more than just a chainsaw man.