Defeated by the Taira siblings, the Kurosaka siblings report their defeat to the "Academy" founder, Sensei. As a last chance, the Kurosaka siblings are ordered to continue pursuing the Taira siblings, and a new assassin, Uzu, a newcomer from Class A, is sent from the "Academy." Uzu, who has an unusual obsession with Nagi, carries out destructive activities under the guise of a mission, and his overwhelming power and abnormal behavior confuse the Kurosaka siblings.
