Full-Contact is the twenty-eighth chapter of the manga Kengan Omega.
At the Rokushin Kaikan building, Koga meets Joji again. Joji reveals he heard about Koga smashing up a hospital from one of his students. Telling his relative to get changed, Joji and Koga sparred with the former showing the clear difference in power between the two of them. Joji then tells Koga that he'll train him.
- Narushima Joji, a character who appears in Sandrovich's other series Fist of the Seeker, is revealed to be Koga's father's second cousin.