Radiation! I Am Struggling Endlessly to Survive in the Apocalypse!

That day! Radiation in the universe breaks through Mercury's ozone layer! Humanity has officially entered an era of crisis! From now on! Space radiation in the universe! Radiation from the sun! The nuclear radiation in Mercury has spread throughout human society since then! "The weapons and technology left to us by our predecessors give us a glimmer of hope!" "Facing countless mutated creatures! How should we survive?" "Look! The most precious thing! A bottle of natural spring water! It's a pity that people who are highly exposed to radiation don't deserve it! It can only be owned by people who are less exposed to radiation!" Since then! Human civilization is facing an unprecedented crisis! Start one round of crisis era after another! Humans! Can you still survive?