The year is 2242. Humanity was forced to seek refuge deep underground due to the unprecedented calamity known as the "Tears of the New Moon," but following the collapse of the underground city-state of "Amasia," they begun to venture back towards the surface with hope of living there once more. Forming settlements called "Nests" scattered across the surface, adventurers known as "Drifters" continues to battle the lingering threat of the "Enders" and mine the "AO Crystals" which are an essential energy resource necessary for the operation of the nests. In the nest "Rock Town" where such Drifters gather, one wishing to become such a Drifter one day, "Kanata," alongside the skilled Drifter "Tokio," went to explore the ruins of an old museum where Kanata happens to discover a very beautiful sleeping "Magus." With the encounter of the mysterious Magus "Noir," a tale of destiny is slowly beginning to unfold. (Source: Official Site, Translated)The year is 2222. It has been years since Tears of the New Moon, a mysterious rain, poured and wiped out almost the entire human race. The poisonous rain gave birth to deformed creatures devouring humans, and humanity fled from the danger. As means for survival, the humans then build an underground haven; Amasia. In this newly built dystopian city, in a pursuit of maintaining their existence, they run into an Artificial Intelligence named Magus. Not knowing how things will work between them, the story of how Humans and AI coinciding and trying to find their truths begin.