Why Did the Apocalypse Happen in Ancient Times?

The ancient apocalypse is just three months away.

The bustling capital is full of music and dancing, and the people live in peace, unaware that a catastrophe is about to strike.

In her previous life, the land fell into ruin. Famine and disease swept across the country, and almost everyone died at the hands of unknown creatures.

Reborn, with the System's help, she quietly makes plans while dealing with the nobles of the imperial palace.

By the time the apocalypse arrives, she has become the ruler of a powerful base.

[Mainly focused on her career, no romance, the making of a great ruler]