This is another manga series I recommend reading.
It's a romance genre manga, pretty short, at 4 volumes. Even though you can call it a Shoujou manga, I'm pretty sure it is published in GanGan comics (shounen manga). The storyline is a little bit dark, not like the usual romance novels you see. The female lead is a victim of rape.
For those interested, you can read in on Mangareader or Mangafox.