At a university training camp, Shirosaki hopes to use the "suspension bridge effect" to find love during a test of courage. However, as soon as he and Ureshino head out for the test of courage, Gero finds himself confronting Naruko, the "sound manipulator." Naruko, who has laid traps throughout the entire test of courage, cunningly tries to kill Ureshino while fighting Gero. The succession struggle began when Ureshino was nominated as the next president. Who commissioned Naruko, the "sound manipulator," to kill Ureshino? Will Gero be able to protect Ureshino safely?

Gero and Shirosaki are invited to the wedding of "Insect User" Toshiki Hanamaki. Shirosaki grins, saying, "Weddings are places where people meet." Also present at the wedding is Tsunagu, a friend of Gero's and a father of three, known as "Needle User." While a happy atmosphere hangs in the air, Yuji Yamada, who holds a grudge against Hanamaki, arrives with mercenaries, intending to disrupt the ceremony. Yamada plans his revenge against Hanamaki using his "Five-Body Explosive Fist," which involves small bombs embedded in both his wrists, both ankles, and his head. Gero, along with Hanamaki's partner Julia Jr., entrusts Shirosaki with the best man's speech and runs off to protect his best friend's wedding.