Mizuha Ichikishima, a third-year at Marehoshi Academy's Takao Branch, serves as president of the Lyrical Tradition Dance Club. As the daughter of a revered Shinto shrine family, she masters Kagura-style traditional dancing. Her personality is characteristically quiet and calm, with a noted aversion to crowded places.

Facing the club's disbandment due to insufficient members and lack of notable achievements, Mizuha proactively intervenes to ensure its survival. She shifts the club's focus toward idol activities, targeting the Prism Stage—a national competition for middle school idols. This strategic pivot leads her to recruit new members Mana Shikimiya and Sayu Tsukisaka, transforming the club into the idol unit KiRaRe.

Her leadership involves steering the group through challenges like member recruitment, song creation, and competition preparation. She collaborates with student council vice president Mii Hasegawa (Minori) on musical compositions, including "Hito Yo Hito Yo ni Hitorigoto/For You! For Me!". Their interactions feature moments of mutual support, such as Mizuha hugging Mii from behind or giggling near her in official artwork.

Mizuha favors green tea and salt mochi dumplings (shio daifuku). Her journey centers on adapting from a solitary traditional dancer to a collaborative idol group leader, balancing her inherently reserved nature with the demands of club leadership and performance. Her consistent focus remains securing the club's future and fostering unity among its members as they pursue their ambitions on the Prism Stage.