Leo Aoi came from unoccupied islands in Africa being a natures boy. Even though Leo has a scary face he is very naive and ignorant and is just a little kid in a 18yearold body. Whenever he sees blood and gets attacked he loses his conscience and becomes violent. He first meets Yuiko after saving her cat from being stuck in a tree. But he runs away when he sees her because he was scared. Later on in the story he develops feelings for Yuiko even calling her his 1 reason to live.