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In a world where “ability users” possess unique powers or forms, Mio, a princess of the human-centric nation Blognig, hides her secret as a mermaid ability user. Engaged to Prince Chika of the neighboring country Aquatia, she undergoes treatments to become human, a process tied to her royal obligations. Her isolated life changes when Yuuri, a young man from another land, arrives as her new tutor and accidentally discovers her true nature. Unlike others, Yuuri treats Mio with kindness and acceptance, sparking a connection that challenges her views on her identity. Their early interactions, marked by trust and shared secrets, set the stage for a journey of self-discovery and defiance against societal expectations.