Rikuya Asahina just wanted a quiet life at his new high school. Unfortunately, he ends up as a desk mate with Ayaka Minazuki—a half-gyaru girl with a tsundere personality who loves dragging him into all sorts of trouble. The problem is, Ayaka is a transfer student who will only be at this school for one year.

As time goes on, their petty squabbles turn into moments that are difficult to forget. But behind the laughter and jokes, a fear begins to grow: what if that one year runs out before they have a chance to say everything?