Kujibiki Tokushou: Musou Hāremu ken - Chapter 30

With the Goddess’ blessing, he became a 『Divine Knight』 and founded an Empire.
As time passed, he grows older, and by the time the heavens called for him to come, the Goddess showed before him, asking for his last wish.

He wished to be reincarnated in the future.
He dedicated all his life for his people, he had no time to master his own arts.
This time, he wishes to live for himself, forging his body to the utmost limit.

The Goddess complied with his wish.
In the far future, the King shall reincarnate as the 『daughter』 of a renowned Knight family.
And, under some circumstances, she is labeled as a failure of a Knight, however——

「How convenient. I can stand on the foremost line without needing any rank. No better training than actual combat!」

Thus, the legend of the world’s strongest, most beautiful Knight Disciple (♀) has begun—

their example, leading to continuous warfare! However, the aboriginal people of this otherworld who have been blinded by the aesthetics of violence! Rightnow! And in the future! Let me teach you what kind of mecha represents the romance of a man! Let me show you what kind of propulsion is the iron torrent! Let me instruct you what kind of weapon is the deterrence for peace (implied by “nuclear” here)! Let me! Teach you! What exactly is the air-to-ground cluster offensive and the all-round air, sea, and land strike!! Gentlemen! I, indeed, love war! But what I love even more is to stop war with war and bring about a prosperous future where the whole world is unified for thousands of generations! Unite all nations and subdue all races! When the whole world is united as one, it will last forever...

Ye Qiu traveled to the Great Wilderness World and obtained the ten thousand-fold return system.

By teaching or gifting the same thing to the apprentice, you can get a high multiplier crit return.

“Ding, you give your disciple a Marrow Cleansing Pill, trigger a thousand-fold crit, and get a Divine Marrow Pill.”

“Ding, you passed ten years of kung fu to your disciples, triggered a hundred times of critical strikes, and obtained thousand years of kung fu.”

“Ding, you gave your disciple the Zixia Sword, a top-grade treasure, which will trigger ten thousand times the crit and get the Immortal Sword Yunxiao.”

All the disciples: “Master is too generous. He never hides his secrets from his disciples, and he gives everything away.”

- Description from novelbuddy

Mike’s life used to revolve around two things: his girlfriend and his work.It was a peaceful existence—no drama, just an ordinary but sweet life.But just when he thought it would last forever, everything changed in the blink of an eye. His world was thrown into chaos when he was diagnosed with Stage IV lung cancer, with doctors giving him only three months to live.His girlfriend of three years left him for another man after he refused to give her his savings from the past two years.Mike would rather spend that money on alcohol, temporarily numbing the pain of his impending death, than fund his ex-girlfriend’s new life with her lover.Then, one day, while accidentally eavesdropping on a conversation in a restroom, a spark of hope ignited in his dead heart.Without hesitation, he signed up as a beta tester for a groundbreaking game—one that allowed players to enter other worlds. In each world, his mission was simple: save the heroine, and she could return with him to the real world.The most incredible part? These heroines would continue their lives and even keep their pre-existing occupations!His first world? A realm where the heroine, clad in a white coat, awaited him like a knight in shining armor. She was the first doctor to ever develop a cure for cancer!From world to world, universe to universe, Mike was followed by a growing number of beauties—each one willing to leave everything behind to follow him into his world.