Ai Hayasaka is Kaguya's personal assistant and childhood friend; her father is Kaguya's godfather, and her mother was Kaguya's wet nurse. The two girls were raised together until the age of two when Kaguya was moved to the Shinomiya main house; on their reunion aged seven, their official master/servant relationship was established. Her family has been serving the Shinomiyas for generations; once prominent and rivaling the Shinomiyas, they were subsequently absorbed into the Shinomiya family in recognition of their fine bloodline. At school, she acts like a popular fashionable girl who wears her skirt short, a loose collar, fancy nails, and accessories, all of which push the dress code. She keeps her association with Kaguya a secret from Miyuki and Chika. When Miyuki visits, she dresses as a maid named Smirka A. Haski who attends an all-girls school and who flirts with Miyuki. When Chika visits, she cross-dresses as the male butler Mr. Haski. Ai is more socially aware than Kaguya, and can be calculative at times, but is also very sensitive as she too longs for a normal high school life and a boyfriend, which results in her teasing Kaguya frequently.