Friday, 2 a.m. From the rooftop of an abandoned school building, a high school girl dropped down.
—Did she jump? Float, thud. A flawless landing.
Her face was deadly serious. And then—another girl leapt down, this time from the direction of a different building.
Where did they come from? Where were they headed? And why did they keep landing in the dead of night, unseen by anyone?
No one knew the answer.