Tokyo Underworld Manga

Two alpha males. One forbidden siren. A bond that breaks every rule. Althea Lake has always known she was dangerous. As a siren, her beauty and voice were crafted by nature to lure powerful mates—and in a world ruled by dominance and legacy, sirens are both coveted and feared. Desired by kings, claimed by titans, and whispered about in secret, they are walking temptation. But Althea isn’t hunting for power. She’s hiding from it. That is, until fate brings her face-to-face with the two most dangerous—and unclaimed—males in the supernatural world. Cassian Morningstar, the Demon King of the underworld and a cold-blooded CEO by day, built his empire with ruthless control. Xanden Moon, a deadly fae warrior and Cassian’s co-ruler, is known for his loyalty, precision, and barely leashed violence. Neither has ever found their fated mate. Until her. Althea is theirs. The bond is undeniable. But a siren having two mates? Unheard of. Forbidden. And potentially catastrophic for the balance of power in their world. Torn between her fear of being claimed and the impossible heat pulling them together, Althea must decide whether to resist her nature—or surrender to a destiny that could consume them all. In a world of magic, power, and primal instincts… some rules were made to be broken.