After foreseeing the terrible calamity humanity was facing, King Gilgamesh summoned several servants to assist his people in the demonic front. But this time, he ended up summoning a certain nameless hero. Now, the King of Heroes and the King of Fakers will have to put aside their differences to defeat the Gods and save humanity.

In a world in which humanity never parted ways with the Gods and became the dominant species, an unexpected variable enters to disrupt its delicate order. After regaining his memories as the nameless hero King of Fakers, Emiya Shirou will have to teach this world why humans cannot be underestimated, and show them all what means to be a real hero.

Without knowing how, and with fuzzy and confusing memories, King of Fakers ends up in a world quite different from his. Now, the EX rank density is facing something he never imagined. A pretty dominant little sister, and having to go on dates with girls who have powers at the level of a heroic spirit to save them. His luck is still E rank.