Humanity has fallen and invaders now own the Earth.   As the last human left, Adam Clemens witnessed it all, repeatedly.  After numerous times sending his memories back to the beginning without a chance of success, he has found a possibility.   By sacrificing all his memories, experiences, and knowledge, Adam tries to cheat and send back a powerful class to his younger self. The returned class corrupts Adam's soul, giving him power but preventing him from growing using the [System].  Adam must find a way to build up his own friends and family before the invaders become strong enough to overpower him.  Can he succeed in winning this war where his predecessor failed, all while struggling with the corruption that has changed his soul?