Have you heard of the "Crowley Flood"? It's the collective term for the clones of Aleister Crowley, each representing "a different possibility that would have come about if he had made different choices in reality." Calculations put their total number at 1,083,092,867. In other words, Academy City's Chairman of the Board of Directors numbers over a billion, but they're currently compressed together, making them appear to be a single person.
The possibilities making up Kihara Ze's "Kihara Flood" aren't nearly as numerous. The possibilities cultivated in Academy City over two years after transmigrating number only in the low double digits. But after his golden finger evolved from the single function of "bringing other anime characters to Academy City" to also allowing him to "travel to those characters' worlds," the number of Kiharas began to grow.
In the Demon Slayer world, there are possibilities such as "becoming a swordsman" and "becoming the Demon King"... Multiple possibilities are being born.
Kihara Ze has come to understand that, in an infinite future, he must travel to infinite universes and nurture an infinite number of "possibilities." Starting from Academy City, the "Kihara Flood" will sweep across the entire infinite multiverse.
