Manga title

I read this manga a week ago but I can't remember the title. It was under top 5 romance at some point. In which the main character attended high school or maybe college. And he friended this really popular guy that later on confessed to him. I remember the main character is able to see the red string that's tied on people's pink to bond love. While no one else can see it. I can't really remember well but in the second chapter or so the students go skiing, but those two end up falling off a cliff. They ended up being alright however they almost kissed. If this made an sense and recognize this manga please tell me if you can?