Lady Murasaki enters the narrative as a ten-year-old girl living in Kitayama, north of Kyoto. She is the niece of Lady Fujitsubo, Genji's stepmother and secret obsession. Struck by Murasaki's resemblance to Fujitsubo and viewing her as a blank canvas, Genji orchestrates her removal from her caretakers, effectively kidnapping her to his residence, initiating her life under his guardianship.

He personally oversees her education, meticulously shaping her into his idealized vision of feminine grace, refinement, and cultural accomplishment, directly modeled upon Fujitsubo. Trained in poetry, music, calligraphy, and courtly etiquette, she becomes the cultivated Heian lady Genji desires. Her physical appearance reflects this ethereal idealization within the anime's style, featuring distinctive clear blue eyes and youthful features.

Initially positioned as a daughter figure, her role transforms significantly after the death of Genji's principal wife, Lady Aoi. Genji formally marries Murasaki, elevating her to his primary consort. She becomes the central woman in his life, managing his household at the prestigious Rokujō-in mansion. Despite her status, her lack of powerful familial backing remains a persistent vulnerability within the court hierarchy.

Her relationship with Genji, central to her existence, carries profound emotional complexity. She feels deep affection and loyalty towards him, yet suffers quietly due to his continued romantic entanglements. This emotional strain intensifies dramatically after Genji's politically motivated marriage to the higher-ranking Third Princess (Nyōsan). Murasaki perceives this union as a deep betrayal and a demotion of her position. The Third Princess's arrival shatters her sense of security within the Rokujō-in and deepens her isolation.

Following this marriage, Murasaki expresses a fervent desire to renounce secular life and become a nun, seeking spiritual solace from worldly attachments and the pain caused by Genji. Genji refuses her request, compelling her to remain within court life. This refusal deepens her melancholy and contributes to a gradual physical and emotional decline, marked by prolonged illness.

Her narrative arc concludes with her death during Genji's later years. Her passing leaves Genji profoundly bereft and contemplative, symbolizing the fading of his world and reinforcing the novel's themes of impermanence and sorrow. Throughout, her character serves as a representation of the cultivated Heian feminine ideal, embodying the emotional costs of dependency and the transient nature of worldly attachments.