Ai Hayasaka is the personal attendant, valet, and childhood companion of Kaguya Shinomiya. Her family has served the Shinomiya household for generations, having been absorbed into their service after a power struggle. Raised alongside Kaguya from infancy, their bond is more like sisters than a typical master-servant relationship. Officially, she is a highly competent maid tasked with protecting Kaguya, managing her schedule, and handling clandestine operations, a position that comes with a substantial salary allowing her to accumulate considerable savings over her decade of service. Her duties demand exceptional adaptability, leading her to master numerous personas: a disciplined maid, a fashionable and rebellious gyaru student at Shuchi'in Academy, the flirtatious "Haysaca-chan," and the cross-dressing male butler "Haysaca-kun" complete with a fabricated backstory. Beneath these facades, her true personality is calm, cynical, pragmatic, and often sarcastic, especially regarding Kaguya's romantic schemes. A major internal conflict arises from her initial assignment by Kaguya's older brother to spy on Kaguya, causing her immense guilt as her genuine loyalty shifted wholly to Kaguya. This guilt culminates during a school trip, where she severs her signature ponytail to evade Shinomiya agents, adopts a bob haircut, and eventually resigns after confessing the truth. Kaguya's forgiveness redefines their relationship as one of equals and authentic friendship. Hayasaka is highly intelligent, observant, and technically proficient, capable of building custom computers and tracking technology trends. Despite frequently dispensing romantic advice in a jaded manner, she has no personal dating experience, a fact that fuels self-consciousness and an impulsive kiss with Chika Fujiwara, whom she often finds exasperating. Financially self-sufficient, she amasses around 40 million yen in savings. Her journey culminates in embracing authenticity and reclaiming a lost adolescence while preserving her bonds with Kaguya and peers.