Synopsis
Nagisa is a typical schoolgirl who often wakes up late, rushes off to class, and meets friends along the way. One morning, she spots a woman in a strange uniform staring at her, which unsettles Nagisa. Later that day, while gazing out the window, she notices a ball bouncing by itself. It suddenly hurls itself toward her window seat, shattering the glass but leaving her unharmed. Turning back to the front, she finds a gaping mouth full of teeth just inches from her face, with no one else around. She screams, and the world snaps back to normal—she is standing, and her classmates are looking at her curiously, wondering why she screamed.