Inside the wooden room.
Kokushibo lowered his head. After a long silence, he slowly said, "Though it is somewhat unbelievable, this subordinate has already conducted a thorough investigation of the Demon Slayer Corps outposts around Natagumo Mountain and Asakusa. So far, there has been no trace of any information related to her. Back then... it was also this subordinate who cut his corpse into two. There was absolutely no possibility of him coming back to life."
"As for the demon-hunting methods she uses..."
Kokushibo was not surprised by that in the slightest.
Just as, no matter how hard he had tried back then, he could only gaze distantly at his younger brother's back—if that girl truly was Tsugikuni Yoriichi's reincarnation, then no matter what incomprehensible methods she used, it would be perfectly reasonable.
—Heaven's favored child could not be judged by the thinking of ordinary people.
Another moment of silence passed.
Finally.
Muzan seemed to have guessed something and spoke in a raspy voice. "It seems the cause of all this must lie with the Ubuyashiki Clan."
"There must have been some change in this generation of Ubuyashiki's precognitive ability, allowing him to discover Tsugikuni Yoriichi's reincarnation. He hid that girl away in advance, intending to use her as a secret weapon against us, then erased every trace of her existence so that we would have no way to investigate!"
After reaching his initial conclusion.
Muzan's thoughts gradually became clearer.
"So that's how it is..."
"No wonder the Demon Slayer Corps has been able to accurately locate the Twelve Kizuki several times in such a short period. Rui was one thing, but this time, when dealing with Gyutaro, they sent out three Hashira at once. They had clearly been planning this for a long time. And from the looks of