Rintaro has become the Medabotter elementary school champion. But then Metabee and Ikki appear before him from the neighboring town. Rintaro fights them on equal terms, but is defeated in an unexpected way! After losing the head part of his beloved Kantaros, Rintaro creates his own custom machine, the Arc Beetle, to further strengthen his Kantaros. The sequel to "Medabotter Rintaro" is finally being reprinted digitally