The students are thrown into a panic by the rumor of "Kuradoni-sama," a ghost story invented by Naruko. In their rampage, they nearly offer Ureshino as a sacrifice to "Kuradoni-sama." The only way to stop their rampage is to stop Naruko. Ureshino, who had been escaping with the help of Shirosaki, decides to take matters into his own hands to protect his friends. Can the shy and introverted Ureshino overcome himself and grow? And with determination, Ureshino makes a request to Gero.

Following Shirosaki's advice, Gero continues his search for a wife. He is asked by Arashiyama Kimie, a "hamster user," to protect her from "assassin hunters" because, despite being a "user," she is not good at combat. Overwhelmed by her enthusiasm, Gero agrees. Shirosaki seems hopeful that Gero and Arashiyama might get along surprisingly well since they are both "users." Later, Gero and Shirosaki are taken by Arashiyama to a gathering of collateral branches of the "beast tamers." There, Gero confronts Nakagawa Momoichi, an assassin hunter and a mutant ordinary person with combat abilities that surpass even top-class assassins. What exactly is his objective...?