Previously on Earth, Alemayehu and Chae-Won were childhood friends in a city in South Korea. As they were both thirteen years old, young and pretty, they were captured by some rapists in a back alley, but Alemayehu escaped and ran to the police. When she tried to run back for her friend, they held her back, but they did not arrive in time for one of the rapists to murder Chae-Won.

Thirteen years later, Maya dies trying to bravely rescue a girl who reminds her of Chae-Won from the same back alley situation, and gets transferred to a ruined world. All previous deities ― except for one last goddess, the same Chae-Won Choi who was her friend ― have abandoned it to its fate. Chae-Won is otherwise stuck ― alone ― in this world; but so is Alemayehu, who she has summoned.

The reason? A cruel endless plague has turned normal living sentient beings into artificial undead ... and also turned a once fertile ground into desert wasteland. This world is larger than Earth, has a larger percent of its surface as a landmass; the plague took nearly no time to spread through the world. For almost half a century this plague has raged, with now less than 0.01 percent of its pre-plague populace free from the plague.

The lone goddess is at her wit's end. To save the world ― or to save herself from going mad upon it ― she gave up on the chance to leave it; she now must summon a Hero who will be her last ultimate Champion to the remaining survivors. Once at a world populace exceeding fifteen *billion* sentient lives, it now has barely one and a half million living, and now twenty billion undead.

The situation has gone from bad to worse, and the state of the world with it; its survivors no longer care to think of it as an ideal world. Despite this, they still try to survive the best they can, or at least to not die out suddenly. The goddess Chae-Won has been trying to nurture an elite few of the remaining populace to be sort of heroes, to mixed results.

Maya, tasked with going to this world to organize and train the survivalists ... just might help bring their world back to the state it once was, with the goddess' help.