Two years before the Second Large-Scale Invasion, Kikuchihara discovered he had a Side Effect, one of superhearing. Because it was deemed a low-class Side Effect, many disbelieved its value leading Kikuchihara to resent it. However, Kazama saw potential in this and invited Kikuchihara to his unit. With the ability to share the auditory information, Kazama Unit rose in ranks and reach A-Class, and eventually #3.
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.
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 favour. As Osamu continually loses, Kikuchihara questions why Kazama even desired to fight him in the first place, and in insistent that Osamu would 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 than Kazama.
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 and pinpoint its weak spot. Kazama uses this information to wear away at the Trion Warrior's defenses until it was defeated...