A-chan Senpai, formally identified in some sources as Amano Akari, appears as a secondary character across related media. She possesses russet red hair, blue eyes, stands 160 cm tall, and weighs 45 kg as a third-year high school student. Previously the head manager of the girls' dormitory, she passed the role to Kanata Futaki but continues assisting with management duties, contributing to a more relaxed rule enforcement under Kanata's leadership. Her dormitory responsibilities include administrative tasks like roommate assignments and logistical oversight, reflecting an organized yet flexible approach. Academically, she presides over the home economics club, which counts Kudryavka Noumi as a member. Her interests gravitate toward unconventional subjects, aligning with a curious and mischievous personality. She exhibits cheerfulness, kindness, and a proactive attitude in helping others, demonstrated by her efforts to resolve Kudryavka's roommate search. Her activities encompass cooking, cleaning, shopping, and swimming. Official media does not depict her in romantic or sexual contexts. Across all appearances, including the visual novel and anime adaptation, her role remains consistently supportive without significant evolution or expanded backstory beyond these established parameters.