OVA
Description
Ritsuko Kübel Kettenkrad holds the position of Student Council President at Rikkyoin Academy, chosen through the institution's lottery-based selection system. Her mixed heritage stems from a German father, a noble and CEO of a major company, and a Japanese mother, resulting in her portrayal as "not too foreign" within the academy setting.

Her leadership is defined by exceptional intellect, strategic acumen, and the reputation of possessing the greatest luck in the school's history. These traits, coupled with significant charisma, establish her influence as unparalleled among recent student generations. She maintains a reserved and emotionally controlled demeanor, often appearing aloof or detached, consistent with her responsibilities. This controlled presence is sometimes visually represented by hidden eyes or the wearing of a helmet, symbolizing her presidential status and authority.

A key element of her past is a childhood friendship with fellow student and next Student Council President candidate, Chihiro Enomoto. They reside in the same neighborhood, sharing a history that includes a significant moment where Ritsuko proposed a marriage promise: she stipulated Chihiro must marry her if he ever stopped "being a crybaby." Despite this shared history, their interactions during council activities are marked by her reluctance to openly acknowledge their past. She avoids discussing the childhood promise in official contexts, though contextual clues indicate it remains a persistent undercurrent in her thoughts and motivations.

Her presidential duty requires strict enforcement of the school's foundational principle that "the kujibiki is absolute," treating lottery outcomes as irrevocable fate. This role occasionally places her in direct oversight of challenges faced by Chihiro and his team, particularly in the 2006 series where the current council assigns high-stakes tasks to incoming members where failure risks expulsion.

Across different narrative iterations—including the original OVA episodes (presented as excerpts) and the 2006 reimagined TV series—her core characteristics remain consistent. However, the 2006 adaptation permits slightly more visible emotional layers beneath her composed exterior, especially in situations involving Chihiro or the pressures of her position. The unresolved nature of her relationship with Chihiro, particularly the unaddressed childhood promise, forms a recurring element of her character arc. This remains unresolved by the conclusion of the OVA storyline, which ends on a cliffhanger without depicting the final resolution of the student council tournament or their personal dynamic.

Physically, she is distinguished by blonde hair and blue eyes, reflecting her mixed heritage. Her design frequently incorporates a distinctive helmet or other visual elements signifying her authority.