Dear Friends (ディアフレンズ) is a 2007 drama film written by Yoshi and directed by Kazuyuki Morosawa.
Yousuke falls for Rina, but her attitude has a feral edge, and they neck but stop short of having sex.
After obtaining a large amount of money under false pretenses (i.e. claiming she is pregnant when she is not and forcing the guy [not Hiroko's boyfriend or Yousuke] to pay for the abortion) and spending it on a bottle of Dom Pérignon (which she sprays over everyone at the club), Rina collapses on the dance floor.
Rina learns that Kanae also had cancer (leukemia), and has died after a bone marrow transplant failed.
Before she can jump, however, she is confronted by Maki, who stabs herself in the chest with a knife and declares that she will share the same pain as Rina and that she does not want to lose her friend.
Maki has suicidal tendencies (as evidenced by scars on her wrist), but sees in her relationship with Rina a reason to keep living.
Hiroko throws away a love letter from Yousuke to Rina that she was supposed to deliver, then claims that she and Emi had three-way sex with him.