in earth after meteors struck, monsters came to invade the world. those who are weak die and those who will do anything to live will live. the concepts of law and peace have been erased and all survivors must change their nature to adapt in this dog eat dog world. Petra tries to save all those he comes across, but is force to be the judge jury and excecutioner every time he faces evil. in this tragedy of a world the lengths to survive and keep sane are all acceptable.