The Case Where a Beautiful Silver-Haired Girl, Whom I Picked up Thinking She Was the Protagonist, Is Clearly the Last Boss

Keith has been reincarnated into the world of the game. To change the despairing course of events, Keith rescues a silver-haired girl, Livia, from the imperial army, who is believed to be the protagonist of the game. However, Livia’s magic and behavior are out of the ordinary, and Keith begins to grow concerned. Hey, is that ……? Isn’t this girl the last boss ……?