Yeah the boys aren't gay but hetero who happen to have done it with a guy. I wish they all started loving or being with each other but they part their ways. It was a good manga tho, just barely a "yaoi".
Tatsumi is clearly bisexual. He was attracted to Orie and screwed him more than once. Senpai might have just been doing the mental substitution, but he got it up twice for Orie, so maybe he was bi, too. Orie was just a wimp going along with it, but it hinted that he was attracted to Senpai. They might all be bi (the guys), although Senpai's might have been about a demented sort of substitution of Yuka.
Gosh, so many people in the comment sections are so mean to the girl...
The psychology of three boys coping with the fact that the girlfriend they all share is dying. I can't say that I liked it. I usually like psychological, a little twisted stories, but I guess I just didn't understand what they felt. And all the rape... I think one of the reasons people didn't like it was because it wasn't really BL, because the boys don't love each other. Definitely not a typical story, so it was an interesting read.