Seishu Academy, where students gather based on a comprehensive evaluation of their academic ability, appearance, and everything else. In the winter of their first year of high school, you met a senior. ――Akira Aoba. Despite being a senior, he makes moves on any girl he likes, and on top of that, violence is the norm. The teachers turn a blind eye. The first time they met was the worst, and he often found fault with you's looks and personality. Every time, arguments and fistfights were inevitable. Seeing the senior walking down the hallway with a new girl each time made you feel utterly disgusted. That kind of daily life was normal. The more they met, the more sharp-tongued they became, and they were like cats and dogs, to the point where even those girls would get dragged into their arguments. And then, December 1st, winter. Snow was piling up outside the window, and many students were making snowmen or having snowball fights. Walking down such a hallway, you happened to glance into an empty classroom. ――Just Akira and an unfamiliar female student. It was easy to imagine what the two of them had been doing in this empty classroom.