Kagaku to Mahou no Kakutouka-tachi

This world is split into two very different kingdoms: the magic kingdom and the science nation. They have gone to war more than once in the past, but those days are long behind them. Nowadays they maintain peaceful relations, each state occupying themselves with developing their unique culture. Once every three years they hold an international mixed martial arts competition. In what is essentially a huge festival, the best fighters of the two nations competes in a grand sparring match for glory and bragging rights.

(Source: MangaHelpers)