Been there, done that, bought the t-shirt, etc. etc.
What They Say:
On the world known as Little Garden, factions and communities compete for power via Gift Games, in which individuals with unusual abilities are set against each other. But where there are winners, there are also losers, and the group called the “No Names” has been so devastated in their conflicts with the Demon Lords that almost all of their 120 remaining members are still children! For surviving leaders Jin and Black Rabbit there seems to be only one hope: bring in outside recruits and gamble that their new abilities will somehow reverse the tide!