In the Supreme Empire that rules the entire universe, swords are the empire's most powerful force, and each sword has its own accompanying wings.
Wing is a highly spiritual being with the most perfect appearance, and must rely on the sword to survive throughout his life.
They are the ones who serve and guard the sword.
When the end comes, no matter how powerful the empire is, it cannot escape the fate of destruction.
When Gray opened his eyes again, he returned to the day when he made the contract.
That day, he became his mortal enemy's partner and his wing. It was also on that day that he did not hesitate to insert the dagger into the heart of the man who became his sword...
If destiny dictates that only one person can prevent the destruction of the world, even if that person is his life-and-death enemy, would he be able to give up his pride and become that person's possession and his protective wings if he had to do it over again?
Or on the other hand, control the most powerful sword in the universe... In your hands?