Mahiro Kyobashi is a student at the ALCA academy in Hokkaido, attending the special Class S for Logicalists in training. She is a girl with a distinctive appearance, characterized by her red hair that falls to her shoulders and her blue eyes.

Mahiro has a very specific and passionate set of interests that define much of her daily life. She is deeply fascinated by Foreigners, the otherworldly beings that Logicalists form contracts with, and she has an equally strong love for tinkering with and building machines. Her personality is marked by an intense dedication; when she sets her mind on a project or an idea, she pursues it with single-minded focus. This driven nature, however, often leads to chaotic results, as her homemade inventions have a frequent and predictable tendency to explode.

Within the story of Hina Logic, Mahiro serves as one of the unique and colorful classmates in the protagonist Lion's circle of friends. Her role is primarily that of a quirky and inventive peer, contributing to the energetic and comedic atmosphere of the academy. A key relationship in her school life is with her classmate Yayoi Tachibana. Yayoi is often the one who bears the brunt of Mahiro's failed experiments, consistently getting angry at her for the explosions her inventions cause. No information is available regarding her family background, specific motivations beyond her love for machines and Foreigners, any significant character development she undergoes, or any notable combat abilities she may possess as a Logicalist.