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The sudden and mysterious disappearance of Tanabe Yoshiyuki leaves a void, her absence directly linked to the severe and frequent oppression she endured at her school. Driven by familial loyalty and a thirst for justice, her cousin Nagisa refuses to let the matter rest. She becomes obsessed with uncovering the truth behind Yoshiyuki's fate and holding those responsible accountable for their cruel actions.

Nagisa hatches a daring and risky plan: she will go undercover. To infiltrate the school's social circles and investigate without raising suspicion, she adopts the disguise of a male student. This transformation is her only means to navigate the same environment that consumed her cousin. As Nagisa delves deeper, her mission evolves from a simple search into a personal crusade for vengeance, forcing her to confront the very individuals who orchestrated the persecution.

The situation grows increasingly perilous as Nagisa's double life strains her identity and her quest for revenge risks consuming her entirely. She must carefully gather evidence and navigate the complex web of school dynamics, where every interaction could expose her secret and derail her goal.