The Ramparts of Ice Season 1

The story centers around Koyuki Hikawa, a socially withdrawn student who keeps an emotional wall between herself and others. The only person she spends time with is her longtime friend, Miki Azumi. One day, her quiet life is disrupted when a boy named Minato Amamiya inexplicably starts trying to break through her barriers. The aloof Koyuki, the high school idol Miki, the overly familiar Minato and the laid-back basketball player Yota share an awkward, occasionally frustrating, yet wholesome student life.