I am trying to remember the name of a manga I read once again that I can't find. I believe it starts off with two guys meeting up in a restaurant and talking. While they are talking it comes out about how they used to slept together with this girl and have threesomes with her. But some where along the line the girl didn't want to sleep with both if them anymore and just wanted one of the guys. And I think towards the end the guy that got dumped killed the girl because he liked the other guy and didn't want to give him up to her. I might have gotten some details confused but if this sounds familiar please help me out. Thanks.