After abandoning her life as an idol, Fuuka Miyazawa impulsively heads to Okinawa instead of facing her troubles at home in Morioka. Lost and burdened, she stumbles upon Gama Gama Aquarium, a struggling old establishment threatened with closure due to financial woes and needed repairs. The spirited granddaughter of the director, Kukuru Misakino, refuses to let the aquarium fade away and sets out to raise funds before summer's end. Intrigued by the aquarium's charm, Fuuka pleads for a job, but her inexperience proves to be a challenge. As Kukuru faces the daunting task ahead, both she and Fuuka must navigate obstacles and uncertainties. Can they muster the strength to rescue the beloved sanctuary that means so much to them?