Quick, what do you do when your best friend's brother kisses you in a club?

I kissed him back, but then I was appalled.  I didn't even like him back when I was in high school, why now?

Holly Lyle has turned into a numb workaholic since graduating college and starting her own marketing business. She doesn't have time for a boyfriend and is more interested in maintaining her image. Then, one night, she goes out to see a rock show with some friends and ends up being propositioned by the lead singer, who turns out to be Izumi Kanbe, the older brother of Mizuki, her best friend in high school.  The older brother she couldn't stand. Even though she pushes him away at first, she can't seem to get him out of her head...or her bed.