As Kanao Tsuyuri and battled on and began to lose ground, Doma's body suddenly began to melt.

Source: https://www.cbr.com/demon-slayer-ending-explained-every-hashira-fate/

Shinobu is clearly channeling her sister to keep her memory fresh and mask her intense anger at demons, but Kanao seems to be building her new free identity around Kanae.

Source: https://gamerant.com/demon-slayer-who-is-kanao-tsuyuri/

Though there were many moments where the fight could have gone in the demons' favor, the heroes eventually came out on top with Kanao and Shinobu's strategic planning and Inosuke's immense speed and strength.

Source: https://gamerant.com/demon-slayer-inosuke-vs-zenitsu-whos-stronger/