Chika Otaki, a spirited high school classmate of the protagonist, radiates a carefree, cheerful energy and dreams of dating a band member, captivated by the allure of romance intertwined with music. She openly questions the protagonist’s refusal to join a band, arguing it could have offered a unique spotlight as the only female member. Rumors about the protagonist being escorted by an older man spark her curiosity, leading her to investigate until she uncovers the truth: the mysterious figure is the protagonist’s older sister. This revelation strengthens their friendship, and Chika begins spending more time with the protagonist.

During one of these encounters, she witnesses a riveting bass performance that ignites a newfound admiration for music. Motivated by this experience, she pivots from daydreaming about band boyfriends to spearheading efforts for a local music festival, channeling her vibrant energy into event planning and community engagement. Her journey reflects a shift from whimsical romantic fantasies to a deeper investment in musical collaboration and grassroots initiatives. Despite this evolution, she retains her trademark optimism, remaining an enthusiastic confidante who bridges playful charm with genuine support.