In their world, survival followed a strict and unforgiving food chain that governed both land and sea. At the very top stood the sirens—an ancient and dominant species feared across every ecosystem, capable of ruling oceans and land with unmatched intelligence, adaptability, and overwhelming power. One of the strongest sirens was Giyuu Tomioka. Beneath them were the strongest terrestrial predators, with werewolves ranking among the highest, feared rulers of vast forests and guardians of the wilderness. The alpha of The pack was Sanemi Shinazugawa. The two species rarely interacted, and when they did, it was usually marked by tension and territorial caution, as even the most powerful land predators understood the superiority of the sirens.

That balance began to shift in an unexpected way. Along the quiet border where river met forest, a single siren, Giyuu, repeatedly left his ocean domain, drawn not by hunger or conquest, but by affection. Night after night, he emerged from the water, determined to approach the forest’s alpha werewolf, Sanemi. The werewolf, scarred, disciplined, and far more emotionally guarded, remained in denial of the siren’s obvious courtship, viewing it as reckless and dangerous. Yet while the rules of their world demanded distance between apex ruler and land predator, the siren’s persistent and clumsy devotion slowly began to challenge everything both species believed about power, territory, and love.