You (Seiya) get talked into joining a group date by your part-time job friends. You take a liking to Sasane, who's happy to listen to you vent, and you were supposed to walk her home - but on the spur of the moment, the two of you end up staying at a hotel... Emboldened by the alcohol, you push Sasane down onto the bed and sleep together for that one night. But Sasane is furious that you didn't finish inside her! You begin to feel a strange, unnatural unease - and you escape the scene.

That becomes the opening act for the stalking she unleashes on you from then on.