Ikki Tenryou is a lively and easygoing boy, though somewhat timid at times. Initially unable to afford a Medarot, his life changes when he finds a medal in a river and uses it to purchase a Medarot model, which he names Metabee. However, the medal appears to be defective, causing Metabee to be stubborn and disobedient.

Despite their difficult start, Ikki and Metabee gradually develop a strong bond through numerous Robattles. While Ikki is not yet a full-fledged Medafighter, his experiences in battle help him grow, mature, and gain confidence over time.