Yona Ichōgi is a member of the Tokyo branch of the hero organization HxEros, fighting alien Censor Bugs. She projects a mature demeanor and possesses a voluptuous figure, long brown hair, and glasses. Her personality combines the perverted tendencies common to HxEros members with a strong sense of responsibility.

She operates alongside fellow Tokyo Branch members Shiko Murasame, Moena Wakakusa, and Tōma Taiga. Her interactions include a noted relationship with Saitama Branch protagonist Retto Enjō, sparked after he aided her teammate Shiko Murasame in harnessing H-energy, positioning her within the team dynamics of the Tokyo Branch.