Five former middle school classmates receive an email from a girl who was their classmate, but disappeared on a school trip 20 years ago. The email causes the five former classmates to meet once again.

35-year-old Keiko Misumi (Rena Tanaka) used to work at a publishing company, but suddenly was fired from her job. Takako Mido (Ryoko Kuninaka) was very popular with the boys in middle school. She is now a housewife, but works as a prostitute on the side. Miya Akiyoshi (Rie Tomosaka) hoped to become a musician, but failed. Koji Higashihashi (Kenta Kiritani) now works as a detective. Yutaka (Koji Yamamoto) works at a bank and is divorced.

These five former classmates now become involved in a strange case.