Kai emerges as a rookie artist under the prominent idol label Judas, navigating the industry alongside his younger twin brother Riku and the agency’s star performer, Shu☆Zo. As the older twin, he vigilantly monitors Riku’s activities, driven by a protective instinct and steadfast dedication to his brother’s well-being. His reverence for Shu☆Zo underscores a profound admiration for the senior idol’s expertise and leadership within their collaborative endeavors.

Within the group Trichronika, Kai operates as a stabilizing force, channeling his efforts into fostering unity among members. The interplay between the twins accentuates his conscientious approach to mentorship, as he carefully navigates his personal ambitions with an unwavering sense of duty toward Riku’s growth and the collective harmony of the team.