There are at least two manga series that were originally serialized in Shounen Champion, that were partially published by Media Blasters before becoming defunct. Those are Apocalypse Zero and Baron Gong Battle. Neither of the two made it past their sixth volumes by Media Blasters, and have never been relicensed since. In Comparison to Sakigake!! Otokojuku, which one would you like to see licensed for a physical release in english.