Need some help ;-)

Hi everyone! I'm looking for a Manga : a young guy, first year student, from countryside, moves to a big town (Tokyo?) and meets his neighbor, an older student(who's very hot of course). The older one starts making fun of the MC, then... I remember they go to the same party, given by the snowboarders Club, and The MC gets poisoned by others students, the older one rescues him. I also remember a funny granny, who's a girls band's fan. But actually, I'm not sure I read it on Mangago .
I'll be very grateful if you know its name