I love this anime very much, but I forgot the name. The story revolves around three brothers and their friend. The brothers are basically in charge of bringing prisionets to the island via a boat as well as catching the escapees. The oldest brother is cool and a skilled fighter. The second brother wants to be just like the oldest brother but always find himself lacking. The youngest doesn't remember the deceased family members as he was too young when they died. The friend of theirs comes from a clan of assassins and his hair is white while the eyes are purple (maybe red) Later in the story a girl from the white haired friends clan shows up but half of her hair is black and one of her eyes is also black. She is a half baked. There is more to the story but I don't want to spoil it so much. Any ideas?