In the Moonlit World, I Have a Hero Simulator

Fujimaru Kyoya, 17, is a transmigrator with a Hero Simulator loaded. [You were born a boy.] [Your family seems to be a fallen knightly house. Your father teaches you swordsmanship, hoping you can draw Caliburn and become King of Britain, defeating Vortigern, the Tyrant King.] [You failed to draw Caliburn.] ... [You learned the truth about Britain and joined Vortigern's ranks.] ... He is the nemesis the Knights of the Round Table cannot afford to ignore; he is the assassin who raised his sword against Gilgamesh; he is Miyamoto Musashi's old friend and rival; he is the successor acknowledged by King Hassan; ...

"I'm just your average high school student."

During the Fifth Holy Grail War, Fujimaru Kyoya holds a holy sword and spouts nonsense with a perfectly straight face.