Anri Kaido is a slightly short teenage girl with long black hair and short bangs, dressed modestly in school uniforms or blouses paired with knee-length skirts. Typically aloof and quiet, she reveals intense passion and deep football knowledge during discussions about the sport, creating a stark contrast with her reserved nature. Though occasionally blunt or insensitive, she possesses an inherently kind heart, and the narrative implies she grapples with self-esteem issues. As heiress to Denji Kaido—CEO of a major sponsor for Tokyo City Esperion FC—her family ties grant her access to the club environment. Her extensive understanding of football drives her ambition to become a team manager. Within the series, she exhibits a likely crush on Tatsuya Fukuda, marked by shyness around him, and shares a childhood friendship with Yūma Motoki stemming from his mother’s employment at her family home. She also develops feelings for Ashito Aoi. Appearing across multiple episodes, she contributes through football-related observations and interactions.