Tsukasa Tsukuyomi, later adopting the surname Yuzaki, originates from ancient Japanese folklore. She first meets Nasa Yuzaki during a snowy night, rescuing him from a near-fatal truck accident while remaining unharmed. After his immediate confession, she accepts on the condition they marry, vanishing afterward only to reappear at his doorstep two years later with marriage documents. Physically, she has long pink hair often secured by a barrette and reddish-pink eyes. She favors elegant attire like skirts and floral yukatas during Kyoto trips, while opting for modern sleepwear such as a long-sleeved pink shirt and striped pajamas at home. Initially calm and level-headed, her personality deepens as her relationship with Nasa evolves. She flusters easily at his affectionate declarations and shows occasional jealousy when he compliments others. Genuine kindness defines her, reflected in caring for others and domestic duties like cooking nutritious meals. Her interests include fervent enthusiasm for films, games, and pop culture, alongside extensive knowledge of Japanese history—recounted as if witnessed firsthand. An enduring lunar connection is evident through her possession of a moon rock gifted by grand-aunt Tokiko. Her background intertwines with "The Tale of the Bamboo Cutter." Revealed as Princess Kaguya’s daughter, she gained immortality via the elixir of life—intended for the emperor but consumed by her father under Kaguya’s instructions. Upon discovery of her immortality, her village hunted her for her believed curative blood and flesh, leading to centuries of isolation and trauma. Her surname, Tsukuyomi, references the Shinto moon deity, emphasizing her lunar ties. Married life with Nasa involves navigating newlywed challenges like adjusting to shared spaces and building mutual trust. She insists on practical choices like affordable wedding rings and gradually shares her hobbies and fears. Her protective nature surfaces when confronting adoptive younger sister Chitose, who initially opposes the marriage. Despite ancient origins, she embraces contemporary joys from gaming to cosplaying Western movie characters. The revelation of her immortality unfolds gradually, culminating in Nasa learning her full past—including influencing historical figures and enduring persecution, recounted with lingering sorrow. Nasa’s unwavering support becomes pivotal as he vows to help her regain mortality, reinforcing their bond and her evolution from a mysterious figure to a devoted partner confronting eternity.