My current manga: Teerra & Windy, you can read here: http://tapastic.com/series/teerra_windy
Synopsis:
In a kingdom far far away, people were segmented into clans, each specialized in a different function. One in handling swords, others in making metal weapons, archery, animal husbandry or any other works needed by the realm.
It was usual to train every child in the arts of the clan they were born within. This practice was well regarded by the king, receiving his full support.
These clans, specially those focused in combat, had however a very cruel habit...
Getting rid of any child that was unable to follow the art taught by it's clan.
...No matter who the child was.