Akashi is an engineering student at Kyoto University with fair skin, a short black bob hairstyle, and dark eyes. She embodies a logical and practical mindset, often acting as the voice of reason among her friends, though she occasionally reveals a softer, more helpful side. Her personality blends analytical thinking with dry humor and subtle kindness. Within the university's film club, she actively creates experimental films that often perplex others. When an accidental soda spill breaks an air conditioner remote during intense summer heat, she immediately seeks repairs, demonstrating her proactive nature. After discovering a functional time machine, she collaborates to retrieve the remote from the past while voicing concerns about potential timeline disruptions. Throughout these events, she partners closely with the protagonist, showcasing trust and sharp observational skills that prove crucial in resolving time paradoxes. She harbors a pronounced fear of moths. At Ozu's instigation, she participates in a prank, writing fake letters to the protagonist under the alias Keiko Higuchi. In the future, she becomes the mother of a son who travels back in time using the same machine under the pseudonym Tamura. Her career continues in a technical field, contributing to time travel technology development twenty-five years later. A persistent element involves a mochiguman keychain she loses; the protagonist finds it but perpetually forgets to return it.