Crossing Timelines: It's Reasonable for Me, the God of Wealth, to Be Short on Money, Right?

[Future Spacetime] [Single Female Lead or No Female Lead]

Arrow Realms emerge without warning, and alien beings invade. The Fatechosen, charged with fighting these invaders, find themselves on the brink of disaster.

And so, those among the Fatechosen with the will to act begin searching for a way to save the world.

"Ten years later, a basic body-tempering method for honing the physique emerges, giving rise to the first martial artists."

"A hundred years later, mental martial arts burst onto the scene, formally establishing the martial path."

"A thousand years later, divine martial artists who nurture organ deities within their bodies officially step onto the stage of history, standing shoulder to shoulder with the Fatechosen."

"Ten thousand years later, the body-tempering method that forms the foundation of the martial path has already undergone countless revisions. Its effectiveness exceeds the original version by far more than a thousandfold."

"..."

After a God of Wealth who can spend financial resources to cross timelines witnesses humanity's extinction, he begins bringing martial arts destined to emerge centuries or millennia later into bloom ahead of their time.

And when the alien beings breach the Arrow Realms and begin their invasion, martial artists rise into the air, gazing at them with broad smiles.

"Every part of their bodies is a potent tonic!"