The protagonist is drawn into the game while playing <Knight Saga:re>, a remake of a game he enjoyed playing. But something feels strange. In <Knight Saga:re>, the only playable characters are Locke from the human side and Zephyr from the Demon World side. However, upon waking up, the “artificial” has possessed the insignificant ninth prince of the Demon World, Strautra. In this incomprehensible situation, the “artificial” is granted the unknown abilities of “Protagonist Revision” and “Power of Conquest.” To survive Zephyr, the protagonist of the Demon World side, the “artificial” transforms into Strautra, altering the game’s narrative. And as the game changes, everyone’s attention turns to the incompetent ninth prince, Strautra…