Kurumi Taiga is a high school student attending West Tech Vocational High School, and she is one of the four girls chosen by protagonist Yu Azuma to complete an idol group representing each cardinal direction. As the "Western Star," Kurumi fills the western position in the formation. Her appearance includes medium‑length brown hair and purple eyes, and she often wears oversized jackets with long sleeves, a style that gives her a soft, cozy silhouette.

Kurumi’s personal ambition lies outside the realm of performing: she dreams of winning a championship at a robotics competition. This focus on technology and engineering sets her apart from the others and hints at a keen, analytical mind. Within the group, she fills a dual role toward Yu, acting as a supportive confidante while also serving as a friendly yet driven rival. That dynamic contrast helps push both girls forward, especially as Yu’s own single‑minded plan to become an idol encounters resistance from real‑world pressures and the differing dreams of the members.

Kurumi’s personality is expressed through her determination. She approaches her robotics goal with the same seriousness that the idol‑group endeavor demands, navigating the tension between her technical pursuits and the expectations of the spotlight. Her relationships with the other three members evolve as they train, perform, and confront setbacks together. While the story follows Yu’s calculated recruitment, Kurumi contributes a grounded, practical energy rooted in her vocational‑school background, and her ability to blend mechanical skill with the emotional demands of teamwork becomes a quiet asset to the group’s dynamic.