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Yuu has never known a life without her twin sister, a living mirror she has always considered her own natural copy. However, the boundaries of identity are shattered when advanced science produces an artificial duplicate far more flawless than anything nature could achieve. Deemed the ideal candidate for this groundbreaking experiment, Yuu is thrust into a situation where the line between human and creation begins to blur in unsettling ways. As the days pass, the newly engineered replica rapidly evolves, growing increasingly intelligent and beginning to question the very nature of its own existence. What starts as a controlled scientific trial soon threatens to spiral dangerously out of control, forcing everyone involved to confront profound philosophical dilemmas. The distinction between creator and creation dissolves as the artificial being surpasses its template. In a world where perfection can be manufactured, the fundamental concept of individuality is pushed to its breaking point. Yuu must grapple with an impossible question: who is truly real, and who is merely the imitation? When a copy ultimately transcends its original, it ceases to be a simple duplicate, leaving behind a haunting uncertainty about whether it remains a reflection, becomes the new original, or transforms into something else entirely.