Marie Nakazawa is a high school student approximately seventeen years old, introduced as a longtime neighbor and close friend of Mikihisa Komaki, a member of the Library Defense Force. From childhood, Marie has harbored deep romantic feelings for Komaki, and over time those feelings become mutual. Her background is shaped by a serious medical condition: during middle school she developed idiopathic sudden deafness, a rare case that affected both ears. She completely lost hearing in one ear and retains only very limited hearing in the other. Because the golden window for treatment was missed, she faces permanent hearing loss. She can still speak, but verbal communication is difficult, so she typically relies on written conversation, often using a cell phone to type messages at remarkable speed. The condition also caused her to take a year off from school, making her one year older than her classmates.

Marie is an avid reader with a deep passion for literature and a strong sense of justice. She dreams of one day joining the Library Defense Force, motivated by her desire to protect books and the freedom to read. Her intelligence is evident in the wide range of books she studies and her ability to research subjects thoroughly. She is determined and courageous, refusing to back down when her beliefs are challenged. Despite her hearing impairment, she does not let it define her; she sees herself as someone with a moderate hearing loss rather than as a disabled person.

In the story, Marie acts as a catalyst for a major conflict. When Komaki recommends a book to her, the Media Betterment Committee deems it unsuitable for disabled readers and arrests him, sparking outrage within the Library Task Force. This incident underscores the censorship system’s injustice and draws Marie into the central events of the film. She also forms a meaningful connection with Iku Kasahara, the protagonist, who senses Marie’s strong feelings for Komaki and supports her.

Marie’s key relationship is with Mikihisa Komaki, whom she has loved since childhood. Their bond deepens as Komaki comes to reciprocate her feelings, and he remains a steady source of support after her hearing loss. Her friendship with Iku is another important relationship, as Iku becomes an empathetic ally. Over the course of the story, Marie develops from a quietly yearning young girl into a more confident individual who actively faces adversity and stands up for what she values.

Notable abilities include her exceptional speed and fluency in typing on a cell phone, which she uses as her primary mode of real-time conversation. Her extensive knowledge of books and her resilience in overcoming the challenges posed by her hearing loss also distinguish her. Marie’s character embodies determination, intellectual curiosity, and the courage to fight for the freedom of expression.