According to legend, consuming the flesh of a mermaid bestows eternal life. Yuta and Mana serve as living evidence of this tale as they wander aimlessly, searching for a reason to live and a remedy for their peculiar condition. Along their journey, they encounter a fearful youth by the name of Masato who appears to dread his mother, Misa. Intrigued by the curious relationship between the two, Yuta and Mana delve deeper into their hidden truths. Strange, monstrous beings further muddy the waters, causing them to question their understanding of the world around them.