Carmon Kingdom, a medieval-fantasy realm, is home to humans and monsters living in harmony. The most popular sport in the kingdom is Monkart Race, a competition that grants the champion the title of knight. Young Jin resides in Latona Village and aspires to be the champion someday. Sadly, the kingdom is attacked by Destro, commander of the knights, who aims to wed Princess Sena against her will. The princess meets Jin while trying to flee, and their encounter frees Draka, a powerful dragon monster trapped in Jin's sword. Jin and Sena, accompanied by their monsters, embark on an exhilarating journey to set their kingdom free from oppression.