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.
Yuiko Kariya
Koji Yamamoto
Seiran Kobayashi
Chikako Kaku
Misako Tanaka
Satoshi Nikaido
Ryoko Kuninaka
Rena Tanaka
Makiya Yamaguchi
Rie Tomosaka
Shinji Takeda
Kenta Kiritani
Ai Moritaka
Yûto Muguruma
Saki Minamino
Suzu Hirose