Hitomi Washio, a first-year student in Class 1-3 at Roubai Girls' Academy, holds attendance number 16. Towering over classmates at over 170 cm, her mature appearance often masks her true age. Her surname means "eagle tail," her given name "pupil of the eye," and her October 30 birthdate aligns with Scorpio.

She chose Roubai Academy due to her volleyball mentor’s legacy there, fueling relentless dedication to the sport. This drive shapes her rigorous training and unwavering commitment.

Typically calm and collected, she displays minimal facial expressions and speaks in a blunt, boyish tone. Confidence and fearlessness define her exterior, yet she forges deep bonds with trusted individuals.

Dominating volleyball, she joined the school club and rapidly became its sole first-year regular through exceptional skill and seriousness. Her sharp eye for athletic potential guides peer interactions. Witnessing Komichi Akebi’s natural prowess during a sports festival volleyball match impressed her, leading to active recruitment efforts for the club, where she believed Komichi could excel. As their friendship grew, she nicknamed her "Komi" for its match-shouting practicality.

Her closest connection is with classmate and dorm roommate Yasuko Nawashiro. They occupy adjacent class seats, co-participate in the volleyball club, and collaborate frequently in academics and club activities, showcasing notable teamwork and mutual support.

Outside volleyball, she reveals a softer side with Komichi’s younger sister, Kao Akebi, displaying instant fondness through playful gestures like carrying her on her shoulders.