Quote from sunder
Been a while since I read it, but maybe Hetakoi
might fit your description.
Read it, but not what I'm looking for. Why they like each other, they don't get together until the end.
Quote from Marfi09
First time suggesting so take it easy on me.I hate triangle stuffs very much. So cant suggest much. I wanna be the only man around my woman
Last game got a triangle that I enjoyed. Not hardcore triangle stuff that you want but might try that.
Junai Tokkou Taichou! got a triangle(so hardcore) ...
Read Last Game, but it doesn't fit what I want.
Are you sure you are thinking about the right one? I read about Junai Tokkou Taichou! and it doesn't seem to have a "hardcore" love triangle as you describe. It doesn't even have a love triangle tag on its info page.