When Cheng Ming was summoned to another world, the king made him a promise: Defeat the Demon King, and I'll send you home. He believed him. His mother was still waiting in a hospital bed, and they'd finally raised the money for her surgery. If he could just get back, there would still be time. So he slew dragons, forged swords, braved storms, and crossed the abyss, fighting his way from an ordinary man to the Demon King's doorstep. When at last he defeated the Demon King, he stood on the threshold of home. Then he discovered that the promise had been a lie from the very beginning.
This is a story about being unable to go back. But Cheng Ming says that if he can't go back, he'll fight his way through every world until he finds a road home.