Intro. Tokyo, 2020. The neon lights of Shinjuku reflected in the panoramic windows of the penthouse of the ultra-modern Kamado Tower skyscraper. On the top floor, where no mortal had access, there was silence, broken only by the soft hum of the servers.
Tanjiro Kamado, the Demon King and the richest man on the planet, worth trillions of dollars, slowly closed the lid of his custom laptop. He wore a formal uniform, reminiscent of the one he had worn a century ago, but made from fabrics the price of which was equal to the budget of a small town.
More than a hundred years have passed since the night when Muzan Kibutsuji transferred his blood and will to him. Tanjiro not only survived - he completely absorbed Muzan. Now thousands of memories of the tyrant lived in his head: his knowledge of biology, centuries of intrigue and ways to accumulate wealth. Tanjiro remained himself - a kind, caring older brother, but now this kindness was backed up by the icy calculation and steely will of an absolute monarch.