|Anime Debut||Episode 1|
|Novel Debut||Volume 1|
|Manga Debut||Volume 1|
|Seiyū||Yumi Uchiyama (Japanese)|
Caitlin Glass (English)
Kisaki is a tall fair-skinned woman who is considered to be highly attractive by Mitsuki Sarue (a perverted Archangel who happens to be the manager of the Sentucky Fried Chicken Restaurant across the street) with chest-length black hair that is tied in a ponytail where it drapes over her left shoulder with bangs hanging over her forehead, dark-blue eyes and a slim but shapely figure.
Due to her position as the manager of the Hatagaya Branch MgRonald's, she is most often seen wearing a female manager's uniform, which consists of a red hat, short-sleeved pale yellow collared shirt, an orange-yellow tie with white stripes, maroon vest, and a form-fitting navy blue skirt that cuts off just above the knee. She also tends to wear brown nylons and high-heels in the same color as her skirt.
She occasionally wears a formal business suit while attending to matters involving the MgRonald's corporate office, and while overseeing important transactions within the restaurant itself.
As the manager of a MgRonalds branch, Kisaki is a strict boss towards her employees as shown when she intimidatingly warns Chiho Sasaki about her constant accidents at work, or when she threatens Sadao Maou not to fail her in competing against a rival company. Kisaki is shown to be a very career-minded individual and a dedicated employee to the franchise, displaying an appreciation towards whoever can increase the store's profits, and a disdain for competitors within the fast-food business. She openly expresses her irritation whenever they fall behind a rival franchisee, her subtle hints of rage even prompting fearful reactions from Maou, the former Demon King of Ente Isla. As such, she is willing to authorize any action necessary to crush their competition.
Despite her intimidating exterior, she is a fair and responsible individual, and displays a friendly and understanding personality towards her co-workers. At one point, she accepts Maou's reason for abandoning work in order to go save Chiho and Suzuno Kamazuki from danger.
- The name Mayumi means "real, genuine" (真) (ma) and "archery bow" (弓) (yumi).
- Mayumi's surname Kisaki means "tree, wood" (木) (ki) and "cape, peninsula" (崎) (saki).
- Kisaki's appearance is very similar to Hitagi Senjougahara from the Monogatari Series.
- Kisaki's threat to send Sadao Maou to Greenland is a reference to the "Princess Bride" movie.