With the development of highly-advanced XR technology, which allows users to feel a realistic sense of the sharpness and weight of weapons, new frontiers of entertainment have arisen! KOG (King of Gladiators), an XR gladiatorial extravaganza, has become the greatest show on Earth! Himemiya Ace, the world's top fighter, vanishes from the public eye after a serious accident. Two years later, her twin sister Zeta - a game streamer known for her toxicity - must take the stage under Ace's name, in order to save Ace's life!