Finally, with so much out of the way and the training arc complete, Banjiro and the Demon Slayer Corps head into Muzan's castle, which is upgraded thanks to the other lower Kizuki being spared and turned into parts of the Infinity Castle, just like the Train Demon. In response, Banjiro also brings a stronger Demon Slayer Corps, letting the groups be split up as they storm towards Muzan, killing all his generals along the way.
When they finally reach her, she doesn't even have Tamayo, so she is greatly disadvantaged as they all jump her, which includes a transformed Shinobu, who took Nezuko's Slut Demon blood as she was getting eaten by the Cultist Demon. In this last fight, Muzan is almost killed, but after getting a bit of Nezuko and Tamayo's blood, she undergoes an enormous change, getting ready to slaughter the Demon Slayers, only for Banjiro to jump in with his mega dick, turning her from a fierce Demon to a submissive yet prideful bitch who gently holds Banjiro as he continues to thrust into her pussy.
In this way, Muzan can be said to have been defeated as the remnants of her army kneel before their new Demon King, completing the story with Giyu and Shinobu added to his harem.
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