One day, in Shunjiro High School, a strange announcement came about the speakers that stated:" Trial One, Commences". After this announcement, the students in class F-66 start overcoming trial after trial, with the possibilities of losing some of their own students, and friends.
The creator of these trials remains unknown to the students, and only reveals their voice to announce the commencement of another trial.
Out of these 26 students who will triumph? But will the victory be worthwhile, after witnessing death after death and even the murder of his/her own classmates?