Long ago , a war unfolded in the mafia underworld which led to the division of the Siren Syndicate and the Phantom Cabal . This is a world were each person has half of a black tattoo which turns red on coming in contact with their soulmate . These tattoos can be present anywhere . The people of these factions have different powers . The Siren faction is led by women and The Phantom faction is led by men . In the outside world the heirs are only known as the children of rich and powerful influential people that people should not cross. But when the two universities of the Siren and the Phantom are merged with the goal of making the two factions one & to forget the past. Will the hearts of the future generation come closer ? MAIN SHIPS : Bokuaka Kuroken Kagehina Sakuatsu Daisuga Semishira Iwaoi