Shirō Kikuchihara/Plot

History
Two years before the Second Large-Scale Invasion, Kikuchihara discovered he had a Side Effect, one of superhearing. Because it was deemed a low-ranking Side Effect, many disregarded its value, leading him to resent it. However, Kazama saw potential in this and invited him to his squad. With the ability to share the auditory information on top of their visual stealth, Kazama Unit rose in ranks and reach A-rank, and eventually #3.

Black Trigger Capture Arc
After returning from Menoeides, he, along with the rest of the Expedition Force, plus Miwa Unit, are assigned to steal Yūma's Black Trigger. The force is intercepted by Jin. Jin uses his Fūjin to launch a sneak attack at Kikuchihara, decapitating him, making him the first loss for either team.

Border Enlistment Arc
He is present at Yūma's debut. He doesn't seem very impressed by Yūma's feat, stating that he was simply used to it. When Osamu accepts Kazama's challenge to a duel, Kikuchihara states that it'll be a one-sided massacre in Kazama's favor. As Osamu continually loses, Kikuchihara questions why Kazama even desired to fight him in the first place, and is insistent that Osamu will lose. After Osamu performs his melee Asteroid, Kikuchihara is surprised, wondering if Osamu actually managed to beat him. He expresses disappointment in the outcome, stating that he could have beat Osamu 100 times out of 100. Utagawa notes that he was unduly serious about the battle; more so than Kazama.

Large-Scale Invasion Arc
Kazama Unit is assigned to fight the Rabbit that captured Suwa. Kikuchihara tells Sasamori to back down because he is weak. Kazama Unit takes on the Rabbit. Kikuchihara purposely lets the Rabbit strike him so that he can use his Side Effect to pinpoint its weak spots. Kazama uses this information to wear away at the Trion Warrior's defenses until it is defeated.