I was interested in the story until it became clear that the girl is just a weak-willed sex toy. The guys are stealing whole show and are much more interesting than she is. Aki is a cold, ridiculously gorgeous and sadistic mystery man, whereas Higa is the more masculine, hot yakuza guy. Between the two I definitely prefer Higa. I've lost interest in the sex because of my increasing dislike of the female character and am only reading this to finish the story.