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

Ikki, Touma, and their allies fight against a Devil with ties to Shocker while attempting to help a Kamen Rider from the future reconcile with his now elderly son.

The Book of Ruin, which should have been sealed, is released along with the mysterious immortal swordsman, Bacht. Darkness overflows from the book, causing the real world and Wonder World…