When the final test of the Defense Force screening exam ends, a mysterious humanoid kaiju revives a neutralized honju and sics it on Kikoru Shinomiya and the rest of the examinees.
With kaiju cataclysms transpiring across Japan, Hoshina heads into battle equipped with Numbers Weapon 10 and soon discovers that wielding the first-ever sentient kaiju weapon won't be easy.
The five identified-class kaiju created by No. 9 gather in the eastern division's area. Specifically designed to eliminate the Defense Force's main players, these kaiju have drawn every division into a struggle.