Inosuke looks at Doma's eyes and enthusiastically realises he is Upper Moon Two. He declares he will defeat him and finally become a Hashira. A confused Doma mentions he isn't hiding his identity as Upper Moon Two. Insosuke sees the injured Kanao and warns her that Shinobu will get angry at seeing her condition. But when Kanao doesn't respond and she becomes upset, Inosuke is stunned into silence. Doma overhears him and mentions that Shinobu will live forever inside him, as "That's how everyone I eat gets saved".
Inosuke is shocked, remembering a memory he had where Shinobu pinky-promised him to not remove the bandage of his injured hand. Inosuke angrily declares "I'll gnaw you to shreds, trash" and charges towards Doma, despite Kanao warning him not to inhale the cold air he creates. Using his Beast Breathing: Fourth Form - Slice 'n' Dice, Inosuke slashes at Doma, the demon commenting on his "messed up technique" as well as noticing his chipped blades and unorthodox fighting style. When Doma attempts to slash at Inosuke's neck, he flips back and deflects the fan with his feet, earning a compliment from the Upper Moon for his flexibility and intrigued by his mask. Inosuke lands next to Kanao and presents her with her blade, stolen from an unaware Doma, to her shock. Doma comments that the demon slayer is fast and grows more ice to attack, only for Inosuke to deflect them back and kick him in the stomach, knocking him away.
As he compliments him again, Inosuke charges forward and readies a slash. Doma comments that the attack is far from the sword's range, so when the boar-headed fighter swings, he become shocked that the attack had reached him and slashes across his eyes. Inosuke had used Beast Breathing: Ninth Form - Extending Bendy Slash, dislocating the joints of his arm to extend his range. He relocates the bones of his arm but is angered that the new attack's inaccuracy made him missed Doma's head, to Kanao's shock.
Doma is amused at his unusual opponent and comments that throughout his own long life, he had never met a fighter like him. Inosuke takes the compliment and says it's because "the other riff-raff losers are nothing compared to me". But while Insouke is talking, his mask instantly appears off his face, surprising him and shocking Kanao. Doma had stolen it without either demon slayer noticing and comments the boar skin is quite old. As Inosuke angrily demands his mask back, Doma suddenly responds that he knows and has seen Inosuke's face before.