Fumie Kotozuka is a character from the manga and anime Sora no Manimani. She is a senior student at Souei High School who holds the position of student council president, a role she has maintained since her first year, making her a three-term president. In addition to her student council duties, she is a prominent and active member of the school's literature club, where she serves as its practical leader.

Fumie is an outstanding student with excellent grades and a strong ambition to become a writer, having already won awards in literary contests. She is known for her strict and disciplined personality, holding herself to high standards and expecting the same from others. This demeanor makes her a formidable figure at school, often seen as a symbol of authority and fear rather than popularity among the general student body. However, beneath this stern exterior lies a softer, more sensitive interior. She has a secret weakness for things like collecting goldfish at festivals, a hobby that seems at odds with her serious image, and she can become easily flustered, especially when confronted with matters of love or anything she deems indecent. Her eyesight is notably poor, making it difficult for her to distinguish people or objects without her glasses.

Fumie has a long and complicated history with Mihoshi Akeno, a fellow student and the driving force behind the astronomy club. They attended the same elementary school, where Fumie, as class president, was often dragged into trouble because of Mihoshi's antics and punished alongside her. A pivotal incident occurred during a middle school field trip when Mihoshi, after giving Fumie the nickname Fuumin, made a comment about Fumie's chest while both were wet after falling into a pond. This embarrassing memory, combined with their history, fuels a significant part of their contentious relationship. Fumie is openly critical of the astronomy club, viewing its activities as frivolous parties rather than serious club work. Her animosity is driven less by principle and more by her personal conflicts with Mihoshi. Her closest ally within the school is Haraguchi, who serves as her secretary and often acts as a buffer for her temper. She also has a more amicable relationship with Sayo Yarai, another acquaintance from elementary school.

Her relationship with the protagonist, Saku Ooyagi, evolves significantly over the course of the story. Initially, she has a negative view of him, dismissively calling him Akeno's boyfriend and blaming him for helping the astronomy club survive. However, as she discovers his genuine love for reading and his talent for writing, her attitude begins to change. She repeatedly invites him to join the literature club, hoping to steer him away from the astronomy club and nurture his literary gifts. This growing admiration gradually deepens into romantic feelings, causing Fumie internal conflict as she struggles to admit her attraction to someone she considers to be associated with Mihoshi.

Throughout the story, Fumie's role is that of a foil to Mihoshi's chaotic energy, representing order and discipline. Her motivations are driven by a desire for propriety and academic seriousness, yet she is also guided by her personal ambitions as a writer. For all her strictness, she is a dedicated and helpful leader within the literature club, showing a friendly and supportive side to its members. A notable ability is her talent for writing, which has already received formal recognition. While intelligent and capable in her administrative roles, she is notably flustered by romantic situations, revealing a vulnerable side that contrasts with her usual authoritative presence.