I Woke Up In The Morning And Became A Seeker, So I Dived Into A Dungeon ~Steadily Leveling Up Starting at the First Level~ - Chapter 179

What was originally an ordinary day, suddenly became a historical turning point. Enormous, mysterious Cubes appeared all over the world without warning and as if Judgement Day’s spears, inserted themselves into the blue planet.

From inside the enormous Cubes, endless streams of monsters gushed out alike raging tides, utterly defeating the unguarded armies of each state in the blink of an eye.

In order for humanity to preserve its final embers, the heads of states issued orders of retreat, to no longer attack the Cubes but rather to cling to remote cities, which they turned into self-sufficient survivor bases and around which they built 100-meter-tall Walls of Life!

Many years later, while bearing the heavy weight of history, the first expeditionary force brought back a world changing piece of information. The Cubes possessed exceedingly high intelligence and they regularly transmitted mission instructions to humans nearby. The mission rewards were incredible.

Since then, humans rushed out of the confines of the walls and once more set foot on the wasteland!

- Description from Novelupdates

Guzi transmigrated into a novel and became a character in a story about a true and false rich heiress.While others who transmigrated into novels become the true heiress, she became the fake heiress. To make matters worse, both she and the true heiress are engaged.She was engaged to the son of a military leader, while the true heiress was engaged to a divorced man with three children from his previous marriage.Guzi's parents, caring for the true heiress, decide to have Guzi marry in her place. In the book, the character “Guzi” was furious and attempted suicide but failed.As a result, she lost the love and favor of her parents. After marrying the divorced man,“Guzi” blamed him for all the wrongdoings and mistreated his children. Eventually, he could no longer tolerate her actions and divorced her. “Guzi” would become a destitute beggar and die miserably on the street.After transmigrating into the book, Guzi left her family and married the divorced man. When she faced the man and his three children, Guzi believed that the original owner of her body made a terrible mistake.This was a painless experience of being a mother without any hardships to endure!On the other hand, the true heiress had to deal with her husband's illegitimate child and fight for family assets. She would lead a daily life full of hardships.The true heiress consoled herself, thinking that she was still better off than Guzi. She had to raise someone else's child and care for an old man.However, one day she sees Guzi stepping out of a luxurious car with a protruding belly, supported by the richest man in the city.Looking aggrieved, Guzi got out of the car and said, “We agreed not to have children!”The man beside her responded tenderly, “Sorry, my mistake.”

The world was once at war with 10 alternate worlds. This was known as the Concept War and our world won 60 years ago. All of this was concealed so no normal people are aware of this fact in the current time.

After the death of his grandfather, the high-school student Sayama Mikoto is suddenly summoned by the giant corporation IAI. He learns this world is headed for destruction due to the acceleration of the Minus Concepts. To prevent this, negotiations must be undertaken with the survivors of the other parallel worlds so their 10 concepts can be released.

And so Sayama is caught up in the final battle to clean up after the Concept War which left behind so much enmity.