Time flowed slowly across the earth, and humanity continued to grow and prosper. Then, one day, the appearance of mysterious resources and an organization disrupted the world's balance. The apocalypse was coming, they said, as they began devouring life and leaving the land scarred beyond recognition. Even with ash blotting out the sky and plunging the world into endless darkness, even as an apocalyptic plague ran rampant, people never gave up on the beauty in their hearts. As time passed, humanity reclaimed vast swathes of land and built beautiful fortified cities in the hostile environment. A young man awoke in an underground laboratory abandoned by a mysterious organization. With no memories, he believed himself to be a surviving test subject. Underground, he encountered a black-haired man who seemed to know him, and was taken back to a human city-fortress, where he began relying on his new benefactor. As the young man learned more about the world and regained his strength, his memories gradually came together, and the truth behind the apocalypse and the organization's plot slowly came to light.
