The ace of Kasumigaoka High School's Judo Club, she graduated from Kawakita Junior High School and is a year older than Michi. Erika is in the 52kg class. She was Hiura's senior at Kitakawa, and is about the same size as her.

Spoiler

She invited Hiura, who was shy, to join the judo club and taught her judo. He loses to the matured Hiura in the club's regular competition, and is forced to be an alternate for the rest of her junior high school career. She is a proud and somewhat overbearing character, but she takes very good care of the younger members, especially Senou, and it is thanks to her guidance that Hiura has become a national-level player. After graduation, she joins Kasumigaoka High School, where they compete against each other in the preliminary round of the inter-high school team competition. After the match, they praise each other for their good fight, apologize for their past misunderstanding, and reconcile, becoming good friends and rivals.