Sara Akizuki, alternatively romanized as Sara Aizuki, serves as one of four home teachers tutoring protagonist Touya during his father's absence, specializing in English language instruction. She possesses a height of 172 cm, a weight of 63 kg, and three-size measurements of 98/52/92, with her prominent bust size being a frequently noted aspect of her character design.

Her narrative role centers on the tutoring arrangement at Touya's residence, which encompasses both academic lessons and intimate, sexual activities throughout the summer. She participates in various sexual scenarios with Touya, including one-on-one encounters and group activities involving multiple tutors simultaneously.

Sara appears consistently across the related OVA adaptations: the 2007 release "Kateikyōshi no Onee-san The Animation - H no Hensachi Agechaimasu" and its 2010 sequel "Kateikyoushi no Oneesan 2 The Animation: H no Hensachi Agechaimasu". In the sequel, she engages in expanded sexual situations, culminating in a group encounter with all four tutors and Touya. Specific scenes involving her character include moments related to consuming ice cream and references to a substance called "A-O drink", reportedly used to enhance male fertility.