The story is about a young boy named Sanshiro Sugata and his miniature PlaWrestler pocket robot with super LSI circuit named Juohmaru. Initially, the show was about Sanshiro's battles with Juohmaru against other PlaWrestlers in robot battle tournaments that were a hybrid blend of modern professional wrestling, hi-tech robot wars and Japanese Noh theater. As the series went on, its focus shifted to Sanshiro exploring the possible uses of PlaWrestling technology in medical implants, and his clash against those who wished to use it for military purposes instead.