Nanami Kanroji is a 16-year-old high school student born on July 20. She attends Sakakino High School on an athletic scholarship, playing for the girls' basketball team. Residing in Haramihama, she previously attended the same middle school as Kotonoha Katsura and Sekai Saionji and has a younger sister named Yae Kanroji. Standing at 173 cm, Nanami is the tallest female character in her series. She possesses violet hair and cerulean eyes, with measurements of 98-68-91 cm, giving her the third-largest bust size among the main female characters. She typically wears her school uniform or a waitressing outfit. Nanami maintains friendships with Sekai Saionji, Setsuna Kiyoura, Hikari Kuroda, and Otome Katou. She is the only main female character with an established boyfriend from the beginning, Kyoichi Kasannoin, a member of the library committee. His devout otaku interests cause her chagrin, and she exhibits shyness during their interactions. Nanami does not become significantly romantically involved with Makoto Itou outside one minor Cross Days route. Her personality blends outward maturity and quiet tomboyishness with underlying pettiness and jealousy. She generally avoids others' affairs but displays strong loyalty, particularly to Sekai. This loyalty manifests as overprotectiveness, leading her to make unfounded assumptions. She holds a negative view of Kotonoha Katsura, believing Kotonoha uses her body manipulatively. This jealousy prompts Nanami to coordinate bullying against Kotonoha, including physical harassment. Her perceptions often stem from misunderstandings, like presuming Makoto and Sekai are dating despite contrary evidence. In the *Valentine Days* OVA, Nanami appears in group scenes at a hot spring resort and later at the Radish Restaurant. At the hot spring, she notices Otome staring at Kotonoha's breasts and joins in teasing Kotonoha by playfully restraining her. She participates in discussions about Valentine's Day plans, remarking that giving chocolates is a waste of time but acknowledging a small chance of success. She does not appear during the subsequent Valentine's Day events. In the main *School Days* anime, Nanami attends a basketball club party in episode 10. The event becomes a screening of secretly recorded videos; footage showing her in a compromising position causes severe embarrassment and a tearful breakdown, contrasting with her teammates' more subdued reactions. In the *Cross Days* visual novel, Nanami's role expands due to her boyfriend's connection to the protagonist, Yuuki Ashikaga. She grows suspicious of her boyfriend's fidelity, particularly regarding Hanon Nijou. Depending on player choices, she may confront him and break up after learning the truth from Kotonoha. In one route, this leads to a brief encounter with Makoto Itou, resulting in the bad ending "Given Up on Everything." She also becomes a target of resentment from Chie Ashikaga due to her basketball skills. In manga adaptations of both *School Days* and *Cross Days*, Nanami plays minimal roles, primarily appearing in cameos or background scenes without significant plot involvement.