Azumi Hazuki, a 22-year-old homeroom teacher, navigates the tense corridors of a high school plagued by unexplained student suicides. Partnering covertly with an undercover transfer student, she delves into the institution’s hidden hierarchies, where wealth and social standing dictate alliances and rivalries. Her investigation focuses on uncovering links between the tragedies and shadowed external forces manipulating the school’s fragile ecosystem. Through discreetly engaging with students and decoding social patterns, she provides critical insights into the toxic dynamics fueling the crisis. No personal history or deeper motivations are disclosed, and her involvement remains anchored to the initial inquiry, with no documented expansion into backstory, future endeavors, or relationships beyond the central case.