Magika no Kenshi to Shoukan Maou - 1.5.2 — The Corrosion of God

Jonathan Brandit was once on the path to becoming a professional basketball player, but a car accident changed his life forever, leaving him wheelchair-bound and filled with regret. Haunted by thoughts of what could have been, Jonathan spends his days shooting hoops in a gym. One day, he suffers a heart attack and wakes up in a completely different world, in the body of another person.To his astonishment, Jonathan realizes he's now living inside the world of a novel he once read, titled “Turning Point,” which revolves around basketball. He has become an “extra” player name Ethan Albarado—a benchwarmer—on the protagonist's team, Lucas Graves.With this unexpected second chance, Jonathan or Ethan Albarado is determined to achieve his dream of becoming a pro basketball player.But in this new world, will he rise to greatness, or will he face new challenges that threaten to bring him down again?

He possesses unparalleled martial arts, all the great Young Masters are under his feet!He has heaven-defying medical skills, even the dead can be brought back to life!He also has a pair of Supreme Quality Divine Eyes, capable of fighting, hypnotizing, you name it!

Protagonist travels between different anime worlds to right wrongs and uncover his reason for being along the way.

- Description from Novelupdates

He was a wealthy and mysterious financial backer who had appeared before her when she needed money the most. After the courtship, she took the money and left.