Misaki Tanabe functions as Neiru Aonuma's first secretary. She supports Neiru's professional duties as a company director and provides assistance during Neiru's hospitalization, facilitating meetings between Neiru and others, including Ai Ohto.

Misaki possesses coily dark brown hair, typically pulled back by an orange, purple, and teal headband, with a single curl extending downward. Her emerald green eyes are framed by purple glasses. Her ear piercings are numerous: a helix piercing, an orbital piercing, and two lobe piercings in her right ear, plus a single lobe piercing in her left ear. These display various earrings: a silver stud, silver cuff, black stud, small silver hoop, and white drop earring. She wears a cropped magenta blazer with darker lapels over a charcoal grey dress. The dress collar features pearls of various sizes.

Her observed interactions suggest a polite and soft-spoken demeanor.

A significant part of her role involves operating specialized machinery to monitor the dream experiences of Ai, Neiru, Rika, and Momoe within the Egg World. This monitoring supplies the group with information about the dream world's mechanics. However, Misaki secretly maintains covert communication with both Acca and Ura-Acca via a digital screen interface. Her responsibilities include reporting recent events involving the protagonists to them. Discussions in these communications imply the girls' dreams constitute a form of research or scientific experiment orchestrated by Acca and Ura-Acca. Misaki is implied to hold deeper knowledge about the experiment's true nature and objectives than she reveals, deliberately withholding this information from the protagonists.

The etymology of her name reflects meanings associated with beauty and nature: "Misaki" combines "beautiful" (美) and "blossom" (咲), while "Tanabe" signifies "field, rice paddy" (田) and "environs, boundary, border, vicinity" (辺).