ec2-3-16-75-37.us-east-2.compute.amazonaws.com | ToothyWiki | RecentChanges | Login | Webcomic A graphic novel series by Akimi Yoshida published in English by Viz.
Allegedly good. Originally serialised in Bessatsu Shoujo Comic. The series is credited with pioneering "most of the genre stereotypes of hot, angsty bishounen and steamy shounen-ai sexuality that we see today in more adult-oriented shoujo titles" [(Review)].
A friend of mine who lives on Hokkaido reckons that shoujo manga has much more sex in it than shounen manga.