Ken Aoki's world is shattered with the loss of his mother. All that is left is two strange objects she willed to him. If the doomsayers all over the media are right, and everything is soon to end, then at least the apocalypse will end his pain. When he stumbles onto his best friend's corpse and is attacked by a powerful stranger that leaves him for dead, he wakes to find himself mixed up with cave dwellers whose hopes rest on the mysterious artifacts in his possession. The beautiful and aloof Rin Uchida helps Ken discover there's more to himself than he ever knew. As the planet is bombarded by natural disasters, Ken and Rin race against time to stop a dangerous adversary that will do anything to complete his objective - destroy humanity at any cost.