One day in Osaka, Chisato evaporated without a word. Paul, who had crossed her path, sets off to Koyasan, a sacred mountain, in the hope of finding her.

As a computer virus based on Pac-Man invades Japan, a group of doctors attack Genm Corp and begin a wave of terror using stolen Proto Gashats. Ghost and Ex-Aid find themselves at the center of the fight in an effort to protect those most important to them. But they aren’t alone, as Heisei Riders from the past join them to stop Dr. Pac-Man!