OVA
Description
Yuiri Haba sports a medium-bob hairstyle featuring side locks and a ribbon-style hairpin, typically dressed in a red school uniform. Peers describe her appearance as cute. Her personality blends compassion and sweetness with noticeable jealousy when witnessing interactions between Kojou Akatsuki and other girls. An avid reader of romance manga, this hobby actively fuels her romantic fantasies.

Born to office worker parents employed by the Lion King Agency and having a younger brother, her family background stands uncommon among High God Forest peers, who are predominantly orphans. Raised at High God Forest, she was nominated as a candidate observer for Kojou Akatsuki but faced rejection due to her inability to master the Schneewalzer technique. Consideration for her family circumstances further excluded her from high-risk missions.

Her operational involvement commences with assignments to capture Gajou and Nagisa Akatsuki at Kamioda Temple. During the Avalon sealing ceremony, she assists in guarding Nagisa and later protects a mysterious girl discovered on a frozen lake, providing her with a coat and ensuring her evacuation. Yuiri frequently collaborates with her High God Forest classmate, Shio Hikawa, including missions such as escorting Glenda aboard a passenger ship. Their vessel collides with shipwrecks during this escort, leading to an encounter with Sayaka Kirasaka.

While investigating Glenda at Blue Elysium, Yuiri and Shio confront Veres Aladar, who seeks to apprehend Glenda under the Holy Ground Treaty Organization's directives. Despite their efforts, they are overpowered in combat. Before losing consciousness, Yuiri instructs Glenda to seek aid from Kojou Akatsuki and Yukina Himeragi.

As a Sword Shaman, she wields Rosen Chevalier Plus, a mass-produced variant of the Schneewalzer-type weapon Lustrous Scale. Her relationships include referring to Yukina Himeragi as "Yukii," maintaining a close partnership with Shio Hikawa, and harboring romantic feelings for Kojou Akatsuki—feelings initially sparked by High God Forest rumors and her manga-inspired fantasies. Glenda expresses particular fondness toward her.

Regarding long-term development, Yuiri becomes part of Kojou Akatsuki's marital relationships, marrying him after several other characters in the sequence.