Mitsugu stays in the same group of Megumi Ozaki,Yoji Kakano,and Hitomi Sakura. During the first test, Mitsugu thinks that the threat of the collars exploding is a joke; so he tries to shoot at one of the soldiers. After he attempts doing so , said soldier presses a detonator and Mitsugu's collar is detonated killing him instantaneously in front of all of his peers.