Movie
Description
Manami Okuda is a student in the Kunugigaoka Junior High School Class 3-E, identifiable by her petite stature of 149 centimeters and her distinctive round glasses, which frame eyes that take on a "3" shape when the glasses are removed. She typically wears her dark hair in twin braids, a style that contributes to her studious appearance, though she later adopts a single braid in adulthood. Her birthday is November 7. Okuda is characterized by an extremely shy, timid, and introverted personality, often speaking to her classmates with excessive politeness. Her nature is so pure and honest that she is incapable of telling a lie, which makes her easily deceived by others. Despite this quiet demeanor, she possesses a deep well of determination and can muster the courage to express her feelings, particularly when faced with injustice or when her classmates are insulted. She finds comfort in the logical and predictable nature of scientific formulas, viewing them as a refuge from the complex and confusing world of emotional language and social interaction.

Okuda's background reveals a significant academic imbalance that explains her placement in the remedial Class 3-E. While she possesses an extraordinary, even genius-level talent for the hard sciences, especially chemistry, her grades in Japanese literature are notably poor. This difficulty with language and self-expression is a core part of her character; she struggles to find the right words to convey her feelings, believing that beautiful prose and nuanced thinking are unnecessary compared to the definitive answers found in math and science. Her primary motivation throughout the series is twofold. Initially, she seeks to utilize her scientific prowess to contribute to the class's mission of assassinating their teacher, Koro-sensei. More profoundly, she is driven by a desire to overcome her communication deficits, learn to express herself, and connect with her peers, ultimately hoping to be useful to her friends and classmates.

Okuda's role in the story is that of the class's resident chemistry prodigy and poison specialist. She is the go-to person for creating a wide array of chemical compounds, from potent poisons like sodium hydroxide and thallium acetate to corrosive agents like aqua regia, as well as smoke bombs and powerful laxatives nicknamed "Victoria Falls." Her skills in this area are so advanced that they exceed what her homeroom teacher, Tadaomi Karasuma, can teach, and she is capable of drawing complex chemical formulas with a single brushstroke. While her physical abilities, close-range combat skills, and strategic planning are among the lowest in the class, her expertise in technical and chemical applications is top-tier, making her a critical asset for specialized assassination attempts.

Her key relationships are central to her development. She shares a close friendship with Kaede Kayano, who invited her to join her group on the Kyoto school trip, an act that helped Okuda open up to others. She also finds a sense of calm with Yukiko Kanzaki. One of her most significant relationships is with Karma Akabane. He is fascinated by her ability to create "suspicious drugs," viewing her talent as a way to escalate his pranks, and they mutually recognize each other as the easiest person of the opposite gender to talk to. Karma trusts her enough to confide in her, and their bond continues beyond graduation. Under the guidance of Koro-sensei, Okuda undergoes significant development. He encourages her to improve her language skills, explaining that her scientific talent will be futile without the ability to communicate her ideas to others. He works with her after school to create poisons, teaching her that assassination, like science, requires understanding and communication to deceive a target. This mentorship leads to her gradual growth. She begins to stand up for her class when insulted by elite students from the main campus and learns to apply literary principles to scientific problem-solving. This allows her to achieve first place in the science portion of the national exams, beating the top students from Class A and earning the right to shoot off one of Koro-sensei's tentacles. Her newfound ability to clearly explain complex concepts proves vital when she deciphers technical data from the International Space Station, providing the class with crucial information to save their teacher. Seven years after her time in Class 3-E, Okuda has fully realized her potential, working at a national medical research institution alongside Kotaro Takebayashi. There, she applies her expertise to develop universal artificial blood, a project inspired by Koro-sensei's unique biological properties, solidifying her journey from a shy, timid girl into a confident and accomplished scientist.