From Commonplace to the King of Heroes (Re-Write)

Haruto Sasaki's future was as bright as the sun, he recently graduated from Harvard with a business degree and has just got back to Japan. Unfortunately, he has a brain tumor that has gone undetected for years, causing him to die shortly after.

However, fate has better plans for him. He finds himself in another world full of magic and monsters with the soul of Gilgamesh sharing a body with him

Note: This re-write tells a completely different story than the original, treat this as an alternate universe.