Ninja Love

From Chibi Manga:

In the megapolis of Tokyo, lives what appears to be a female ninja! Kamui Shino, 16 years old. Her first job as a ninja is to protect the famous actor Kitaoji Kou. As she's been secretly yearning for Kou, Shinobu's first jow means a lot of emotions, but for a ninja:

"The first and absolute rule is to never fall in love",

It's an absolute rule, still... Furthermore, Kou's real character actually is of a very S-type of young man?