In order to curb the crime running rampant in the elementary school system, a new solution has been enacted in the form of the School Judgment System. Now the young students themselves will be responsible for solving the issues that befall them. But are they up for the task?
Tento once again finds himself in a tight spot when he's accused of trying to murder the school’s Madonna, Reiko Shiratori, and locking her unconscious body in a shed. Can Abaku argue his friend to freedom? Meanwhile, the Red Ogre sends out a warning to Abaku, Sarutobi, and Yui: Find out his identity before graduation or he will murder all of their classmates again. Can Abaku solve this final mystery in time?