Has the world suddenly split into four? Keiwa Sakurai, Neon Kurama, Michinaga Azuma, and Tsumuri are flung into different worlds. And for some reason, a different Ace exists in each…

Keiwa and Sara are transported to the World of Shinobi where they assist Rentaro and his allies in fighting the powerful Amakusa Shiro Tokisada.

Geats, Revice, and Ryuki wage a fierce battle royale that transcends beyond the Heisei and Reiwa eras.