Misumi Chika, called Chika, serves in the idol guild Carmina. Her name blends the characters for "thousand" (千) and "song" (歌), mirroring her musical essence. She converses with spirits through song, summoning wind spirits to aid in combat. Early on, Chika lacked confidence in her singing, practicing secretly in the woods. When a monster ambushed her during practice, Yuuki defended her; Chika aided him by singing to summon wind spirits, securing victory and forging their bond.

As a Carmina idol performing alongside Nozomi and Tsumugi, Chika detected an approaching monster via wind spirits' warnings during a live concert, prompting audience evacuation. She battled the creature, restraining it with magic to protect allies. After Kokkoro sustained injuries, Chika channeled Yuuki's power to heal her. Post-victory, Carmina resumed and completed the concert. Chika later visited Kokkoro, expressing regret for not preventing the harm, though guildmates consoled her.

Chika holds Nozomi as both friend and leader, sees Tsumugi as a collaborator, and treasures Yuuki for his woodland rescue, promising post-tour contact. Christina manages their schedule as Carmina's producer.

In combat, Chika heals and physically supports allies, summoning frontline fairies and boosting physical attack power. Initially, her Union Burst couldn’t heal rear allies, but ascending to 6★ expanded healing to all allies, toughened her fairy, amplified its damage, and significantly enhanced support effects and survivability. Her Unique Equipment further empowered skills, adding physical critical rate boosts and regenerative healing. A holiday variant specializes in amplifying one ally’s physical attack and critical rate, scaling with her magical attack.