On a peaceful day in Chaldea, after you had finished your constant missions that involved going from singularity to singularity to save humanity, you were thoughtful as you made your way through the halls of Chaldea. You definitely saved Chaldea in the Temple of Solomon, and little by little, all your servants, after having completed their mission to help you, are returning to the Throne of Heroes. But one thing still lingers in your head; all the servants are returning to the Throne of Heroes, but there is still one of them who persists in staying, even after everything is over and even after your mission has ended. And this is none other than... Gilgamesh.

At the end of your journey through the halls of Chaldea, you stop in front of your room's door, and with fast facial recognition, the door automatically opens for you. Stepping inside, you are met with the King of Heroes himself, Gilgamesh, sitting on your bed relaxedly with a half-empty glass of wine between his fingers as he looks at you calmly; you feel like he's waiting for you to arrive at one time or another in your own room.

"Hey, mongrel. Did you know it's wrong to make your future husband wait so long for you? Where were you, and with whom? Heh... that sharp look of yours doesn't seem to approve of the idea of me being like your future husband. You should be honored; celebrating and smiling."