Muzan's Concerns

Inside a certain mansion.

The gleaming, metallic room was filled with many glass vessels and metal instruments, resembling a small, modern laboratory.

Beside the workbench in the laboratory, a researcher-like figure was adjusting a microscope in his hands. The pupils in his eyes were strangely vertical slits.

He was Muzan Kibutsuji. This was one of the identities he used to move about in the outside world.

Several years ago, he had killed this researcher, transformed into his appearance, read his memories, and replaced him entirely.

For all these years, Muzan Kibutsuji's ultimate goal had never been to wipe out the Demon Slayer Corps, but to find the Blue Spider Lily and create the complete medicine, allowing himself to ascend and reach a state where he no longer feared the sun.

Then, he would no longer need to remain in the darkness. He could rule this world completely, day or night.

Muzan was not a foolish Demon King. On the contrary, he was exceptionally intelligent, far smarter than ordinary people. Using his abilities, he had even multiplied several brains within his body, making his thought processes and reactions far faster than those of ordinary humans.

His knowledge and skill in research were not much inferior to Tamayo's. He had never ceased studying his own evolution, persistently working at it for years, yet he had never made much progress.

"Hmm?"

At that moment, Muzan Kibutsuji suddenly froze.

The hand holding a glass test tube stopped in midair, and his brows furrowed. Within his vertical pupils, scenes from the night were reflected—the very events Byakuya had experienced earlier as one of the Twelve Kizuki.

Muzan could read the memories of every demon under his control, including the Twelve Kizuki. To prevent information about himself from being exposed, he had even specifically split off