The heavens fell, and the world began to crawl.
When a meteorite struck near Mount Fuji, it brought more than just stone. It brought the "White Worms"—fluid-like entities that seem harmless, but carry a mutation-inducing substance capable of rewriting biological life.
To the Taka Organization, these creatures are the key to a forced evolution. Their goal is simple: Create a world where only the strong survive, and the "weaklings" are culled.
Kemonji Matsumoto is just a 15-year-old student at Ketitsu High who wants to draw and protect his genius younger sister, Yakushi. But when a tragic car accident leaves him hosting the very substance the world fears, Kemonji becomes a Nichiju.
Caught between his humanity and the parasite within, Kemonji must lead a group of friends to stop Taka’s vision of a brutal new Japan. In a world where being "gifted" means everything, the most "regular" boy might be the only one who can save it.