A story about being sexually dominated by a childhood friend who has become something inhuman, despite resistance being futile.

The protagonist, a middle school student named Nanoka, visits her childhood friend Chihaya, who has been absent from school for about a week, to see how she's doing. When she enters the room and listens to what happened, Chihaya tells her that she has contracted a disease that is turning her into something non-human. As Nanoka tries to leave when it's time to go, for some reason she is suddenly pushed down onto the bed by her childhood friend!...