Yuki appears mysteriously one night to university student Souta, insisting he saved her in the past—a claim he cannot recall. She struggles profoundly with everyday aspects of the outside world, unfamiliar even with basic tasks like shopping or using a fork. A defining trait is her intense aversion to physical contact, especially skin-to-skin touch, hinting at deep trauma or a unique physiological condition. This fear significantly complicates her interactions and daily existence. Men actively pursue Yuki, seeking to capture her. They target her due to a power she possesses, intrinsically linked to the fate of the world. Their goal is to force her into sacrificing her life to ensure global peace, positioning her ability as vital for humanity's survival. Her life before encountering Souta remains largely undisclosed. However, her extreme unfamiliarity with the world and the relentless pursuit suggest a background marked by isolation, concealment, or potentially an otherworldly origin. The exact nature of her power and the root cause of her touch aversion form the central enigma of her existence. Development unfolds as she gradually adapts to cohabiting with Souta. Small shifts in her behavior and comfort levels emerge during this time. This progression culminates in a pivotal revelation where she discloses a hidden truth: the source of her power, the reason behind her touch aversion, and the full implications of her role in the world's future. This disclosure directly addresses the core questions surrounding her identity and the high stakes of her potential capture.