The first episode opens with the mysterious suicide of a junior high school girl, Yomoda Chisa. She was a classmate of Iwakura Lain, a quiet, 14-year-old junior high school girl. One of the other girls in the class has been receiving e-mail messages from Chisa, and Lain discovers she also has mail from Chisa.
She explains in the mail to Lain that she just abandoned her flesh…