This is from a very sweet manga called "Tenshi Ja Nai!" (I'm No Angel!).
Izumi has long hair and is, in fact, a boy.
Hikaru has short hair and is the heroine.
"Tenshi Ja Nai!" was written by Shigematsu Takako, if there are any fans out there!
This is for KanameGirl 'cause she got me hooked on this one!