Mikage Koutaro is a God Eater, a person who can kill impure gods and absorb their power. However, his job causes him to be discriminated against by many humans and gods, though all he wants to do is help people. Thus, our story begins...

A high school student has been seeing visions of a girl in his dreams, when suddenly he meets her at school. Oddly, they can both see (and touch) each others guardian spirits. What is relationship between them, their guardians and the truth behind the dreams?
(Source: M-U)

The young ninja Kagetora has been given a great honor?to serve a renowned family of skilled martial artists. But on arrival, he's handed a challenging assignment: teach the heir to the dynasty, the charming but clumsy Yuki, the deft moves of self-defense and combat.
And yet, Yuki's inability to master the martial arts is not what makes this job so difficult for Kagetora. No, it's Yuki herself. Someday she will inherit her family dojo, and for a ninja like Kagetora, to fall in love with his master is a betrayal of his duty, the ultimate dishonor, and strictly forbidden. Can Kagetora help Yuki overcome her ungainly nature . . . or will he be overcome by his growing feelings?