Death's Inheritor

In a world were humans in their greed started wars and set off a series of events that would let mother nature take her revenge and wipe out most of humanity and in the process create beasts and unlivable habitats for humans, people will develop amazing abilities to fight back against these harsh conditions, but some like Shin Vigato will have an even harder time than others will he be able to crawl and pull his way to the top or will he live a constant life of ridicule and abuse.