6 Days 'Till Reckoning (dropped really old work)

Then, on the 6th day the world came to an end. June 16th, year 2132, humans were exposed to the 'mist,' Most of humanity was wiped out, but those who remained were granted with what they believed to be immortality. The world was rid from war and death and the people have abandoned God. Follow the story of Yuuma, an im...