Chika Ōtaki, a high school classmate of Aoi Aioi, exudes a carefree charm and lighthearted optimism, prioritizing daydreams of marriage over future plans. Her attention turns to Aoi after the latter rejects an invitation to join a band—a decision Chika deems a tactical misstep, envisioning the social benefits of being the lone girl among male musicians.

Intrigued by whispers of Aoi being escorted by a mysterious man after school, Chika persuades Aoi to uncover the truth, leading them to Aoi’s older sister, Akane. The discovery sparks a budding friendship, with Chika increasingly drawn into Aoi’s world. Witnessing Aoi’s magnetic bass performance at a rehearsal leaves Chika awestruck, solidifying her resolve to contribute to the local music festival. She throws herself into organizing the event, eager to network with musicians and amplify its success.

Though well-intentioned, Chika’s enthusiasm often propels her into the orbit of performers, sparking occasional misunderstandings or logistical hiccups. These minor disruptions contrast her broader role as a catalyst—bridging connections within the festival’s ecosystem while subtly underscoring Aoi’s evolving artistic path.