Ayumi Okamoto represents Ekibasha restaurant as a waitress combatant in the Variable Geo tournament, a high-stakes martial arts competition offering substantial prizes but severe humiliation penalties for defeated participants. She has black hair, black eyes, stands 1.58 meters tall, and weighs 48 kilograms.

Her notable forgetfulness manifests in incidents like chasing a train to retrieve a forgotten bag, where she met Yuu Asuka—this absentmindedness is likened to potentially forgetting her own head if unattached. Clumsiness further defines her demeanor.

Despite lacking specialized combat training, she unexpectedly won her inaugural match against Diane Ryan by unleashing unforeseen power during the fight. Ayumi’s primary combat ability stems from a natural talent to precisely observe and replicate opponents' techniques. This rapid mimicry of fighting styles enables her to maintain competitive parity against more experienced adversaries.