The Second Chance (Futuristic Male Reader X Mikasa)

An officer in the United Command Space Alliance, in an elite group of the Hellhound Company, called the 'Fireteam Leaders', Y/N L/N (Call Sign: Orionis). He was the Space Peacekeeper, carrying the rank of the Captain, Y/N's company did a terrifying sacrifice that saves humanity, but with the cost of their soul...