Kagura Uzuki stands as a central figure in the narrative, distinguished by her lengthy waist-reaching blonde hair and striking blue eyes. She typically wears her hair in a braid and is seldom seen without her signature hat, gloves, and stockings.

Her path crosses with the Trinary task force when its members—Miyabi Koigasaki, Gabriela Lotaryńska, and Ayami Kunimasa—intervene in a Phenomenon incident during a live idol concert, rescuing both Kagura and Tsubame Ouse. In the aftermath, she and Tsubame choose to join the team, becoming its newest operatives.

This military-sponsored unit specializes in confronting Phenomenon, self-contained pocket dimensions born from human emotion that overwrite reality in localized areas. The team’s mission is to disperse these anomalies by either defeating or appeasing the emotions that generate them.