Minori Segawa once aspired to be a teacher, but her path shattered following a traumatic incident during her teaching co-op. A tragic accident resulted in the deaths of several students under her supervision. Consumed by guilt and emotional agony, she abandoned her university studies and joined the military organization FLAK. Within FLAK's first platoon, Minori serves as a mission control operator, providing critical tactical support and communication for field operatives engaged in network-based combat. She is the essential link between the physical world and the virtual "Wired" network, coordinating pilots operating mechanized combat units called Simulacrums; her colleagues heavily rely on her competence in this high-stakes environment.

Despite projecting professional confidence and responsibility during missions, Minori exhibits profound shyness and social insecurity in personal interactions. She often appears flustered or reserved, especially around fellow FLAK member Tohru Souma, for whom she develops romantic feelings. This stark contrast between her assured operational demeanor and her personal timidity reflects the lasting psychological impact of her past trauma. Her withdrawn nature and difficulty forming personal connections stem directly from unresolved guilt and responsibility for the students' deaths.

Minori's relationship with Tohru Souma evolves significantly depending on narrative paths. She acts as both a supportive colleague and a potential romantic interest, frequently expressing concern for his well-being while navigating her own complex emotions. In some storylines, she directly challenges his singular focus on avenging his friend's death, urging him to consider a future beyond revenge. These interactions reveal her deep empathy and struggle to reconcile her feelings with his dangerous pursuits. One narrative path sees her supporting Tohru's decision to desert FLAK and join the terrorist group Fei Dao, demonstrating her loyalty despite the profound moral complexities involved.