Erina "Eririn" Isayama performs as a member of X-UC, a new-generation idol unit in the multimedia project *Idol Bu Show*. Led by music producer Kōnosuke Sanada—reincarnated from the legendary Sengoku strategist Sanada Yukimura—X-UC fuses cutting-edge musical trends with motifs drawn from their leader’s historical roots. The group’s sound merges modern genres with thematic elements echoing Japan’s Warring States period, reflecting Sanada’s influence. Erina’s role within the unit and her contributions to its artistic vision remain integral to X-UC’s identity.