Kurenai (紅, lit. "Crimson") is a Japanese light novel series by Katayama Kentarou (片山 憲太郎), with illustrations by Yamamoto Yamato (山本 ヤマト). A manga adaptation started serialization in the first issue of Jump Square magazine and had its last chapter published in the June 2012 issue. An anime adaptation by Brains Base aired in Japan from April 3, 2008 to June 19, 2008.
Sixteen-year-old Kurenai Shinkurou is an authority in settling disputes between people, and finds his life turned upside down one day when he is assigned as a bodyguard for Kuhouin Murasaki, the daughter of a powerful plutocratic family.
It is a quite beautiful anime, with some scenes that will stick to your mind. It is quite short (12 episodes), and it is quite a masterpiece as well.