The legendary King of Uruk, Gilgamesh, was once considered a mere myth, but the discovery of his majestic tomb in the Middle East sparked a surge of scientific interest. The construction of Heaven's Gate, a collaborative effort by international scientists, aimed to advance human knowledge. However, a terrorist attack on the facility triggered a catastrophic explosion, unleashing a phenomenon that gave birth to supernatural beings. Amidst the chaos, siblings Kiyoko and Tatsuya encounter mysterious men with extraordinary powers, who claim to have the ability to restore balance to the world. Yet, these powerful beings are bound by factional allegiances, raising questions about their true intentions: are they saviors, or harbingers of destruction?