I dont really remember, so A is confessing his love to B, but get rejected. Not long after, B transfer school. And when they in high school (or univ), B suddenly show up in front of A's school. in the middle of winter, he's waiting for him. Now B is in love with A (B is kinda yandere now). That's all i can remember. I'm sorry for my bad english. Thank you.
http://www.mangago.me/read-manga/love_knot/tr/64557/page/
is this the one?
Oh god, my head hurts