Spirits—beings who walk among humans in the guise of girls, yet exist beyond mortal comprehension.
Endowed with phenomenal power, their manifestation from neighboring realms triggers cataclysmic disasters called ‌Spatial Quakes‌, branding them humanity's ultimate nemesis.

Against this existential threat, mankind faces two choices:
Annihilation through brute force... Or

"Date them. Make them fall for you."
Meet ‌Shidou Itsuka‌ — gifted with the ability to seal Spirits' powers through romantic conquests and a fateful kiss.
Having saved both humanity and Spirits alike, his precarious peace now unravels.
The colossal ‌DEM Industry‌, a global conglomerate coveting Spirit energy, mobilizes its full arsenal to eliminate him.
Simultaneously, a mysterious girl buried deep in Shidou's memories emerges from the shadows—
As countless schemes collide, the greatest battle across timelines erupts.