Shiina Taki is a first-year student at Hanasakigawa Girls' Academy and the drummer for bands MyGO!!!!! and Ave Mujica. Voiced by Coco Hayashi, she is depicted as a bold, unsociable 'lonely wolf' who clashes with others but fiercely protects those she acknowledges, especially Tomori. Burdened by her superior older sister's shadow, Taki struggles with an inferiority complex and high self-expectations, finding salvation in Tomori's lyrics and songs that allow her to express unspoken feelings. She transitioned from viewing the band as 'Tomori's band' to recognizing her bandmates as colleagues, showing leadership potential despite occasional unilateral actions. Taki holds contempt for Sakiko's departure from Crychic but worries for her, and maintains close ties with friends like Umiri Yahata.