One day, Yamato Satsuki catches a glimpse of the jagged teeth hidden beneath the mask worn by his classmate Aisu Kiraragi. Rather than being put off by what others might consider strange, Yamato becomes captivated and begins approaching her with the persistent desire to see her teeth again. Kiraragi, a gyaru girl with a tsundere personality, has kept her mouth covered for years due to childhood trauma — she was bullied and ridiculed for her shark-like teeth, and the mask became her armor against further humiliation. What starts as a simple curiosity on Yamato's part slowly evolves into something deeper as the two begin spending time together, sharing rooftop lunches and gradually opening up about their pasts. Yamato's sincere admiration for her teeth, rather than pity or discomfort, allows Kiraragi to confront her insecurities and reclaim her confidence. The story unfolds in a typical high school setting, revolving around a small cast of characters. Yamato is portrayed as goofy and sometimes dense, but deeply caring, choosing to defend Kiraragi with words rather than violence when bullies appear. Their relationship grows through these shared vulnerabilities, with each helping the other face wounds they have long buried. The jagged teeth, known as gizaba, serve as the emotional anchor of the narrative — a symbol of past pain that gradually becomes a source of connection and acceptance.