The Physician

Muzan Kibutsuji, the first demon and humanity's greatest nightmare, finds himself inexplicably thrown back a thousand years to his human death—given one chance to rewrite the fate that turned him into the monster who would haunt the Demon Slayer Corps for centuries.

When Muzan Kibutsuji wakes up in his human body from a thousand years ago with all his memories intact, he must decide whether to reclaim his demonic throne or rewrite history and prevent the tragedy that transformed him into the Demon Slayer universe's most feared monster.