Asuna Kujo emerges from an affluent family, entering the narrative through an arranged marriage proposal with Shun Mitaka orchestrated by their relatives. Her sheltered existence includes graduating from an all-girls university and residing with her parents, who meticulously attend to her needs. This upbringing fosters extreme shyness and a soft-spoken demeanor, often making her difficult to hear. Despite privilege, she radiates exceptional kindness, warmth, and innocence without a trace of snobbery.

Her profound love for dogs defines her: she owns six, calling them her "children," and relies on their reactions to gauge people’s character. Their instant approval of Mitaka fuels her immediate attraction and conviction he is her destined partner—a stark contrast to his intense cynophobia. She remembers every dog’s name she encounters.

Aware of Mitaka’s initial feelings for Kyoko Otonashi, she pursues him quietly in her reserved manner. Mitaka frequently attempts to end the engagement but hesitates, fearing to hurt her or confront her dogs. A turning point occurs when she observes his inauthentic smile in a tennis competition photo where he placed second; her empathetic remark about this facade makes him recognize her compassion and their potential for mutual happiness.

Her devotion leads her to prioritize Mitaka’s well-being over societal norms, risking familial disapproval to support him during a crisis. Their relationship culminates after a drunken misunderstanding where Mitaka mistakes her dog’s pregnancy for hers and proposes out of duty. Discovering the truth, he realizes his genuine love, vows never to make her feel secondary, and they marry.

Now Asuna Mitaka, she gives birth to twin daughters, Moe and Mei, with a third child expected.