Name of a Red-string of fate gangbang H-manga?

I saw a manga on faku before about a matchmaker girl who can 'see' which people who are fated to be together, who is at a onsen trip with old classmates, where she is there to basically just pair everyone else up. A guy she knew back in school is sick of the orgy that the classmates are having so he leaves room and finds her outside, where she tells her concerns about how she feels about her power. it seems at first they will get together and they do have sex but in end, the guy gets lead away by one of the girl classmates, and the matchmaker girl is left alone by herself again, cursing her power of the red string of fate that seems to let everyone else find a partner except her.

What title hentai manga is this?