Flame of Recca
Recca was an average ordinary boy, who happened to like nijas. He finds a unique girl and fall in love with her. He decide to be her ninja and make her his princess. but evil forces starts to target the girl inorder to obtain her special healing powers.
One day as an dark and mysterious women enters his life, recca finds that he has some extrordinary powers. Now he must use these powers to protect his friends and himself from a long lost brother, who holds a hatred against him.
Overall a good classic anime. The anime covers the first half of the manga.