The story revolves around a young protagonist named Jacker (or Zapper in some dubs) who discovers a "Bumper," a spherical creature with unique powers. In this universe, players compete in "Bumper Battles," a hybrid of pinball mechanics and monster battles. Jacker aims to become the Bumper King. He is joined by his friends as they travel, collect new Bumpers, and thwart the plans of rival battlers and antagonists who wish to use the creatures for domination. The central mechanic involves launching the Bumpers like pinballs to attack opponents.