Fumio Murakami is a third-year student at St.樱丘学园 (St. Sakura Academy), attending class 3-A. She is 18 years old, born on November 2nd, making her a Scorpio, with B-type blood. Standing at 160 centimeters tall, she is a member of the school's Library Committee. Her quiet and reserved nature often leads others to see her as the quintessential library girl, a figure some refer to as the flower of the library. However, this perception is largely a result of her significant difficulty in expressing her emotions and a general lack of skill in conversation, rather than a genuine desire to be distant. Because of her silence and the trouble she has finding the right words, Fumio is frequently misunderstood as being cold or aloof. In truth, she is a kind and thoughtful person who feels deep gratitude towards anyone who takes the time to speak with her, and she can feel genuinely sad when her intentions are misinterpreted.

Fumio is almost always seen with a book in hand, as reading is her primary hobby. She has a particular fondness for cake, especially shortcake, though she worries about the effect it might have on her figure. Conversely, she strongly dislikes liver. In academic terms, her best subject is classical literature, which aligns well with her literary personality. In the context of the story, Fumio is one of the key characters. She serves as the representative for the cool attribute, making her a starting character for players who choose that stat in the original game. Her role often places her in the library, which is her primary domain within the school. Her hair is a distinctive bluish-silver color, often styled with a braid, and her typical attire consists of a dark blue blazer over a white shirt with a red ribbon, a red plaid skirt, and black high socks.

The most significant relationship in Fumio's life is with her best friend, Erena Mochizuki. On the surface, they appear to be complete opposites; where Fumio is quiet and introverted, Erena is energetic, gregarious, and impulsive. Their friendship began when Erena, an aspiring photographer, noticed Fumio on a subway train and became captivated by her quiet, melancholic beauty, describing it as love at first sight. Erena asked Fumio to be her model for a photography contest. Initially, Fumio was deeply reluctant and resistant. She struggled to articulate her feelings but eventually rejected the offer, feeling she was not good enough or expressive enough to be a proper subject. This led to an awkward period between them. However, Erena persisted, and the rift was mended during a date where they ate cake together. Fumio confessed that her real fear was that she was too plain and inexpressive. Erena showed her a candid photograph she had just taken, proving that Fumio’s face was full of subtle emotion and that a fake smile was not what she wanted. This realization helped Fumio see herself differently, and she agreed to be the model. The resulting photos won the contest, and Fumio’s warm, joyful expressions in the images helped the rest of the school see a side of her they never knew, leading her to make new friends.

Through this friendship with Erena, Fumio experiences significant character development. She begins to move beyond her self-imposed limitations, realizing that she is not the emotionless person she once believed herself to be. While still shy and prone to speaking in a polite, formal tone befitting an upperclassman, she is shown to be actively working on her social skills. Her inner world is rich with emotion, and she holds a strong interest in the complexities of romantic relationships. An example of her growth is her participation in a beauty contest, where she took first place and was sincerely grateful to those who supported her. Fumio’s notable ability is not a physical or magical power, but a quiet strength of character: a resilient inner personality that persists beneath her timid exterior, and a deep capacity for gratitude and growth when met with patience and understanding from her friends.