FLAGS ~ Ueda Satoshi
Ouka is the greatest empire and rules over 1/3 of the world. To prevent conflicts from other countries, they hold a battle competition once every 8 years. In this competition, 5 candidates, known as "Patriots", from each country are to battle against each other and the winner will be granted fame and honor. This story follows Kurou, a boy who walks the same footsteps as his father to become the strongest patriot ever, along with his team...
-Taken from Mangahelpers.com
This manga IMO is great really different concept and characters with characters everyone will enjoy!