Fate: The Chaotic Fifth Holy Grail War

Gilgamesh hadn't had an opponent run away halfway through a fight in a long time. Especially not one who suddenly ripped open a hole in the air and jumped through it halfway through their fight. Furious, Gilgamesh grabbed his Master, Kishinami Hakuno, and jumped in after them. As soon as he arrived, he inexplicably ran into his own projection. After absorbing its memories, he finally understood: Oh, this is when the Fifth Holy Grail War took place at that Holy Grail disaster site in Fuyuki? Kishinami Hakuno: ⊙▽⊙ Are you sure you know what's going on here? Gilgamesh: Are you looking down on this king? I know what's going on here, and I even know exactly what will happen in the upcoming Fifth War! The next day, Father Kotomine brought back Lancer Karna, whom he'd forcibly kidnapped. Kishinami Hakuno: What about Cu Chulainn...? Gilgamesh: ... Before long, Gilgamesh realized... this Holy Grail War isn't the one I experienced! Even the participants are different! Why is this Holy Grail War such a madhouse? Why is everyone fighting over the same woman? (This story featuring Gilgamesh and a female lead crosses over with Blood Moon, Evernight. Just think of it as a parallel-world extra. It has nothing to do with the main story.)