TV-Series
Description
Nagi Kodachi is one of the main characters in the story. She is a high school student at Shiomi Academy and serves as a member of the Library Committee, though she is not a member of the Library Club. She lives next door to Kyoutarou Kakei, making them neighbors. Nagi is revealed to be a shepherd, the one who sends the mysterious text messages that guide Kyoutarou toward changing his fate. She uses a form of magic to arrange for Kyoutarou to experience the Library Club with several girls, implying that she orchestrated their involvement. She is also Kyoutarou’s childhood friend, and later in the story it is disclosed that she is his half‑sister, affectionately calling him Onii‑chan.

Physically, Nagi is of average height with green eyes and short bright red hair that she styles into twin tails. She is noted for being very attractive and having a well‑endowed figure, which sometimes causes concern among the other girls when she is around Kyoutarou. Her height is 152 centimeters, and her weight is 45 kilograms.

In terms of personality, Nagi is quiet and reserved, spending most of her time in the school library as an avid book lover. She sees the library as a place of peace and sanctuary. Despite her introverted nature, she is kind and caring, always ready to help others and quick to notice when someone is in need. She can be independent and strong‑willed, not afraid to speak her mind or stand up for what she believes. However, she also comes across as lazy and somewhat unfriendly toward Kyoutarou at first, often warning him about his actions regarding the Library Club and the girls around him. She has a casual demeanor and sometimes delivers cool remarks, yet she harbors a hidden fear of animals. Nagi has a strong sense of duty and responsibility; she is methodical and detail‑oriented, with a tendency toward perfectionism. She values tradition and order, which aligns with her role as a shepherd who ensures the proper course of events.

Her primary motivation is to guide Kyoutarou and help him find happiness, as she has always admired him. Her involvement as a shepherd stems from her desire to see him fulfill his potential and to bring about a positive outcome for the Library Club members. Throughout the story, Nagi develops from a seemingly aloof and detached neighbor into a character whose deep loyalty, hidden compassion, and genuine bond with Kyoutarou become clear. Her relationship with him is central: initially marked by teasing and warnings, it gradually reveals a long‑standing affection and a familial connection.

Nagi’s role in the narrative is pivotal. She is the catalyst for the events that bring the Library Club together, using her shepherd abilities to send the initial message that sets Kyoutarou on his path. She also possesses the power to access the magic library and manipulate certain outcomes. Her abilities are tied to her identity as a shepherd, allowing her to influence the futures of those around her. Ultimately, Nagi Kodachi is a key figure whose quiet strength, love of books, and dedication to helping others make her an essential part of the story’s heart.