Ayumi Himekawa, daughter of acclaimed actress Utako Himekawa and successful director Mitsugu Himekawa, emerged as a recognized prodigy from childhood. Initial roles leveraged her family connections, fueling her fierce determination to succeed independently and avoid arrogance, a resolve cemented by the memory of finishing last in a school relay race. She believed true achievement demanded personal effort beyond inherited privilege.

Her development was deeply defined by rivalry with Maya Kitajima. Ayumi first acknowledged Maya's exceptional acting talent during a shared practice session, instantly viewing her as the lifelong competitor for the legendary role of the Crimson Goddess ("Kurenai Tennyo"). Though possessing advantages like beauty, wealth, and critical acclaim, Ayumi envied Maya's access to profound emotional depths in performance—a skill critics noted Ayumi initially struggled to replicate. This professional jealousy surfaced fleetingly, such as a moment at Plum Valley when she briefly considered not warning Maya about a dangerous bridge, a thought she instantly rejected.

Ayumi actively pursued diverse roles to broaden her range, embracing minor or unconventional parts. During a performance as Tom in *The Prince and the Pauper*, she improvised by begging for "money" with a hat to win over children disappointed by her unglamorous portrayal, surprising observers who assumed such actions were beneath her. Her commitment extended to extreme method acting: preparing for the role of Orgeld, the embittered Princess of Winter in *The Two Princesses*, she swapped lifestyles with Maya—living on the streets, neglecting hygiene, and enduring isolation to embody despair and resentment. Conversely, she excelled as the compassionate Princess of Spring, Aldis, in the same play, drawing inspiration from religious iconography like a Virgin Mary statue to convey grace.

Her quest for the Crimson Goddess role intensified through rigorous training and sacrifice. She meticulously studied the original performer, Chigusa Tsukikage, replicating movements and aura but initially failing to grasp the character's spiritual essence. A pivotal moment occurred during rehearsals when Ayumi sustained a head injury saving a fellow actor from a falling stage light, resulting in partial vision loss. Against medical advice, she postponed surgery to continue training, learning to perform using shadows and auditory cues with her mother's support, demonstrating profound resilience.

Professionally, Ayumi upheld integrity, defending Maya against rivals using underhanded tactics. When actress Norie Otobe sabotaged Maya's career during Maya's grief over her mother's death, Ayumi deliberately took the supporting role of Carmilla in a production starring Otobe, intentionally overshadowing Otobe's performance to expose her lack of genuine talent.

Despite their intense rivalry, Ayumi maintained profound respect for Maya, viewing their competition as mutually elevating. She believed winning the Crimson Goddess role required surpassing Maya through artistic merit alone, not malice or circumstance. This dynamic drove her relentless pursuit of perfection while upholding a sense of honor throughout her journey.