The main antagonist in Siren Apocalyptic is a Siren Apocalyptic monster. According to legend, Siren Apocalyptic is a massive humanoid creature, meaning that its structure is similar to that of a person, but it is much larger and bonier, and instead of a head, it has several sirens attached to the body via sinewy ligaments. If you hear the distinctive sound of sirens while walking through the forest, it is best to flee without looking back, because Siren Apocalyptic spares no one! You take on the role of an agent sent to scout the situation on the radiation island. Your mission is to set up surveillance cameras on the island so that your leadership can observe it and figure out why a swarm of monsters has appeared on it, and most importantly, to try to identify and destroy a dangerous creature known as the Siren Apocalyptic.