A powerful earthquake in the Shinjuku area of Tokyo released waves of horrifying monsters that had been hiding within the depths of Earth. The city was destroyed, and only a few humans survived. A team of fighters was assembled in an underground complex and sent to fight the monsters on the surface. One of these fighters was imbued with special psionic powers and was entrusted with a mission of utmost importance.

Ashe is a side-view shooter with some platforming elements. The player can explore several interconnected areas, though certain locations can only be accessed in a specific order, after having fulfilled other objectives or acquired the necessary items. The player character uses his psionic ability to shoot energy balls at enemies, which causes his ESP level to be gradually depleted. Certain areas require jumping or climbing on structures to bypass.

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