Saki, a female transfer student, sports long orange hair in a gyaru style paired with vivid red eyes. Her hair features an accessory of two small balloons—one red and one white. She wears a school uniform consisting of a yellow vest over a white t-shirt, a red ribbon denoting her third-year status, a blue skirt, white calf-length socks, and brown shoes. Her physique includes notably large breasts, comparable in size and shape to Sempai's but lighter in weight.

Leading the Street Performance Club, she initially plots to take over Sempai's Magic Club. Her specialty involves crafting balloon animals, though her acts display clumsiness mirroring Sempai's magical mishaps. Inspired by her younger brother Masashi's dedication—whom she affectionately calls "Ma-kun"—she pursues street performance. Saki exhibits a perverted, provocative personality, frequently teasing others with sexually charged remarks and openly highlighting her cleavage.

Her relationship with Masashi involves intense, obsessive affection that breaches boundaries, as she effusively praises his looks and skills, causing him discomfort. Despite her confidence, she relies on Masashi's presence to motivate her performances. After losing a breast size contest against Sempai, she and Masashi abandon their rivalry and join the Magic Club. This integration fosters collaborative activities like club training camps and joint performances with Sempai and Assistant.

Her ongoing character development includes Magic Club engagements, such as chemistry-based tricks with Madara-san and beach scenarios. Core traits—her provocative humor and brother fixation—persist consistently.