The Ramparts of Ice.

Socially inept, Higawa Koyuki maintains a wall between herself and other people. She spends her time in high school alone, until she meets Amamiya Minato, a boy who keeps trying to close the distance between them for some reason?! The loner Koyuki, the popular Miki, the boundary-less Minato, and the kind basketball player Youta. This is the story…