High school hallways are a minefield of social cues and unwritten rules. Most people navigate the noise of the basketball court and the crowded cafeteria with ease, but some find safety in the silence. It is easier to hide behind a barrier than to risk the messy reality of making a connection. In a world where social standing is everything, staying invisible is a survival tactic. But walls are meant to be scaled, and even the thickest frost starts to crack when someone refuses to take the hint and leave you alone.

In the world of high school manga, the loner is usually waiting to be saved, but Koyuki Hikawa built her "wall" on purpose. Her daily life is a quiet march toward graduation until Minato Amamiya crashes into her orbit. He is loud, intrusive, and completely lacks the concept of personal space. When this human sunbeam decides to melt the ice, the resulting friction pulls in the popular Miki and the easygoing Yota. Their lives tangle together through accidental honesty and messy misunderstandings. As her quiet isolation begins to crumble, Koyuki is forced to face the heat of new feelings. Can she survive the vulnerability of being known, or will her defenses shatter under the pressure of letting someone actually see her?

Also known as: Koori no Jouheki, 氷の城壁.