Ch. 342World Will's Cheating
Oboro watched Muzan defeat Kokushibo and the inheritors after the Demon Slayer world's will secretly preserved him. When Muzan claimed victory, Oboro rejected the outcome and prepared to continue the game on a different path.
- Oboro judged that Doma had the advantage over Gyutaro because Daki burdened her brother, while their fight remained undecided.
- Muzan unleashed his blood mist across Infinity Castle, transforming the surroundings and infecting Kokushibo and the other inheritor.
- Muzan's cells overwhelmed Kokushibo, and he absorbed him as the remaining inheritor became a mass of flesh.
- Oboro sensed that Little Tree had intervened to keep Muzan alive, despite Kokushibo and the inheritors dying in battle.
- Muzan approached Oboro and declared himself the winner, but Oboro revealed that the world's intervention had preserved him and declared that Muzan's path no longer held up.
- Muzan realized Oboro intended to kill him and shouted that he would never die.