Light and Yomi relish their time immersed in video games, however, their fun comes to an end when Light receives a message from Alpha, who operates under the employ of a mysterious figure called King. In no time, they find themselves transported into an unknown realm, tasked with freeing Princess Melody from the clutches of a sinister demon lord. Light believes it to be his destiny, but Yomi isn't exactly thrilled. Nevertheless, they join forces with Alpha, an intelligent robot that heightens their expertise as they proceed on their perilous journey.