30 Days Left Before Rebirth, the Demon Killer Was Stabbed by His Teammates

I was born in a magical world, and my awakened ability is to "devour" all magic. That night when I killed the Demon King, it was not the Demon King who stabbed me to death, but three "comrades" who had promised to share life and death together. My childhood sweetheart Novi burned her own life to bring me back from the brink of death, and then used a magic that had never appeared in this world to send me back 30 days ago. This time, I only have 30 days left - to tear off the traitor's disguise, dig out the truth behind it, and save the girl who sacrificed her life for me.