Tae Ōto (大戸 多恵 - "big/great," "door," "many," "favor/benefit") is Ai Ōto's mother, a tall, beautiful woman with dark-blue hair typically tied back and left-swept bangs, alongside distinctive yellowish-amber eyes. Often seen in a white shirt patterned with blue squares, she presents as soft-spoken, calm, polite, and kind. Tae demonstrates unwavering concern for Ai's well-being and cares deeply for her daughter. Since her divorce from Ai's father, she has raised Ai diligently as a single parent, handling both home and work responsibilities with perfection according to Ai. While her current occupation remains unspecified, she previously held the position of editor-in-chief for a fashion magazine. Tae is currently in a relationship with Shuichirō Sawaki, Ai's homeroom teacher, who frequently visits their home.