Five years ago, a catastrophic disaster ended humanity’s peaceful life in a single day. Mysterious “Special Zones” of varying difficulties began appearing across the globe. <br><br> Maya Ichijo, who nearly cleared all 100 zones to achieve the “Grand Slam,” is betrayed by her comrades and killed during the final trial. <br><br> But in her last breath… she awakens in the world before the disaster struck. <br><br> Now, armed with her past memories, she vows revenge— Because in this world, the real monsters aren’t the zombies… but humans.