Lamune, an average fourth-grader with a love for video games, stumbled upon a way to make some money through helping a girl sell her unplayed games. To prove his strength in the field, he aced the game "King Sccasher" at home, leaving the girl amazed. Soon after, he found himself in Hara-Hara World, where he meets Princess Milk. She identifies him as "The Blood Relative of the Chosen Hero Lamuness," who can aid in the mission of reviving the Guardian Knights. Lamune's task is to enter the shrine and release Tama-Q, who will assist in freeing the Knights. Each mecha, except the King Sccasher, shows free-thinking and decided to assist Lamuness. On the other hand, Don Harumage along with his partners, Da Cider and Lesuka, were against Lamuness.