九名陌生人乘坐的从危地马拉飞往美国的小型飞机坠毁在偏远的墨西哥丛林。幸存者一一被谋杀,剩下的乘客必须在成为受害者之前找出凶手。。Shinobu and her class are preparing for a play for their school's cultural festival while Aya feels a little distanced from Shinobu for not having any elementary school memories with her. The story will takes us back to the past where Shinobu, Yoko, and Aya in their third year middle school year are preparing for their highschool entrance exam.。