|Anime Debut||Episode 1|
|Novel Debut||Volume 1|
|Manga Debut||Volume 1|
|Seiyū|| Yumi Uchiyama (Japanese)|
Caitlin Glass (English)
Mayumi Kisaki (木崎 真弓 Kisaki Mayumi) is the manager of the Hatagaya MgRonald's where Sadao Maou, Emi Yusa, and Chiho Sasaki are currently employed.
Ms. Kisaki is a tall woman with dark eyes, fair skin, and a slim but shapely figure. She has long black hair with bangs in the front, the back of which is usually styled into a ponytail that she drapes over her left shoulder. 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. Ms. Kisaki 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.
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, she is a strict boss towards her employees, as shown when she intimidatingly warns Chiho about her constant accidents at work, or when she threatens 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 Sadao 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 from danger.
- Her appearance is very similar to Hitagi Senjougahara from the Monogatari Series.
- Her threat to send Maou to Greenland is a reference to the "Princess Bride" movie.