World strongest system (Remake)

Begging scanerio: earth had been attacked by demons, all the humidity died in the Demon invasion. Toru's last survival of humanity taking his last breath, his stomach had a big hole made by a demon. Toru takes his last breath and dies,as he wake up he greeted by his mother. Toru checked the date in his smartphone and realised his come back 20 years in the past before demon invasion. Current date is 12 junaruy, 2012 Toru recoled the day the dungeon and towers started appearing on earth, and people start awaking and started getting power, they all guide by a system window, which show tham they , name, leval, status and skill and there rank. People call the awakening humans player " since they get a system that looks the same as a video games system. The day it started appearing was 14 junaruy 2012 Toru had two day, after two day he goes to the first tower that appears in Japan and entered inside it the tower called The tower of grisha.