Miyamoto is a karate student, a yellow belt in Isshinryu, to be exact. He knows a lot of moves, and at his school, is dealing with powerful school gang "the Heika no Tekken" and its leader Shigeru Yugi. He fights barehanded. When not fighting, he can be pretty fun, along with his 7-year-old sister Tatsuo Mitsuri. He is the great-grandson of Isshinryu inventor Tatsuo Shimabuku. His school has a fighting dojo, but aside from that and the Heika No Tekken, the school is normal.