An email message from a girl who had gone missing on a school excursion 20 years ago leads five former classmates to meet again and get embroiled in a baffling incident: 35-year-old Misumi Keiko, an editor who was suddenly laid off from the literary department of the publishing company where she works; Midobara Takako, once adored by guys when she was a junior high school student and now a housewife involved in sex for money; Akiyoshi Miya, a musician facing a setback; Higashihagi Koji, who has become a detective but is content with being a sergeant forever; and Sabajima Yutaka, a divorced bank employee. These five former classmates now become involved in a strange case. ~~ Adapted from the novel "Gekiryu" by Yoshiki Shibata.