Koibana Kiseki

Boy meets girl, but in this case, the girl is part of a family specializing in fighting evil spirits. Kamishiro Renge battles evil spirits with the help of her assistant cat Tama. The boy is... just a boy. Yuta fell in love with Renge the moment he met her, but will he be able to keep up with her profession? Will she be able to lead a normal life with Yuta?

(Source: MangaHelpers)