Y/N has always loved the ocean a little too much. While most people fear deep water, she finds comfort in it—spending countless evenings alone on her yacht far from shore, swimming beneath sunsets and storms alike without realizing something beneath the surface has been watching her for months. Hidden deep within the sea are Katsuki Bakugo and Eijiro Kirishima, two ancient sirens disguised beneath myths sailors were never meant to survive. Vicious predators by nature, they hunt humans without remorse, ruling the ocean with violence, instinct, and terrifying beauty. Massive tails, glowing scales, razor-sharp claws, and inhuman eyes make them monsters beneath the water—but on land, they can become something even more dangerous: men. Beautiful ones. After a violent storm throws Y/N overboard into open water, the two sirens save her instead of letting her drown. From that moment on, something begins changing between all three of them. What starts as fascination slowly becomes attachment, then obsession, and eventually something neither siren has ever experienced before: Love. Now caught between the human world and the deadly creatures lurking beneath the sea, Y/N finds herself dangerously close to two predators struggling against instincts that tell them humans are prey—not something to protect.