Movie
Description
Mutsumi Mitsuba attends Ōsai Academy, sharing a class with Takatoshi Tsuda as first-years before progressing together to second year. She founded and leads the school's judo club. Physically, she possesses long black hair typically secured in a high-back ponytail and maintains an athletic, excellently conditioned build; her best friend Chiri Nakazato specifically notes she has nicely shaped breasts, with this appearance remaining consistent.

Her personality radiates energetic cheerfulness, making her a recognized "moodmaker" who uplifts any atmosphere she enters. She forms friendships effortlessly with both genders. Despite exceptional martial arts prowess, she faces significant academic challenges beyond physical education, often dozing in class and struggling to sit still for long periods. Her pure-hearted innocence leads her to frequently misinterpret or entirely miss sexual innuendos from peers like Shino Amakusa and Aria Shichijō, taking suggestive remarks literally – such as mistaking Aria's comment about boys satisfying needs as advice on reducing hunger. She similarly misunderstood her parents' nighttime activities as "wrestling training."

Deeply dedicated to the judo club, Mutsumi demonstrates remarkable strength and skill as its top fighter. While initially aiming for a Muay Thai club, she compromised to establish the more popular judo club among her friends. She trains rigorously, frequently initiating sessions with high energy levels that necessitate a large appetite to sustain her demanding physical activity. Despite her martial arts potential, she occasionally voices her ultimate dream of becoming a bride.

Mutsumi harbors a longstanding crush on Takatoshi Tsuda, likely sparked when she first sought his help founding the judo club. She addresses him familiarly as "Takatoshi-kun," discusses him often with friends – prompting teasing from Chiri – and exhibits visible signs of affection: embarrassment when appearing sweaty near him, hurriedly fixing her hair upon his entrance, or freezing in panic during unexpected physical contact, like accidentally pulling him on top of her. She privately admits finding him cute. Her athletic confidence contrasts with romantic obliviousness; she skated effortlessly while others held Takatoshi's hand for support and misinterpreted his reason for declining her dinner invitation, failing to recognize the unintentional dismissal of her feelings. Her crush is widely acknowledged within the judo club and by observers like Ranko Hata, who notes Takatoshi could easily persuade her.

Her relationships extend beyond Takatoshi. Best friend and judo club vice-captain Chiri Nakazato acts as her tsukkomi and offers romantic advice. She is close to Suzu Hagimura, whom she calls "Suzu-chan," receiving academic tutoring and attending sleepovers at Suzu's home. She respects seniors Shino and Aria, though her innocence filters their suggestive remarks, and interacts with original judo club members like Nanako Umibe.

Additional traits include severe motion sickness causing distress during bus travel to matches and a tendency to freeze during unexpected intimate moments with Takatoshi. Subtle development occurs, such as growing self-awareness in later chapters, while her core innocence and judo dedication remain consistent. Observational moments, like Takatoshi blushing after seeing her in a sweat-drenched uniform, highlight ongoing mutual attraction.