Mana Hiiragi is a seventeen-year-old high school student who becomes a member of the organization SIRRUT after being saved by the protagonist Saya at the beginning of the film. Her primary motivation for joining is to locate her missing father, a reporter who had been investigating the group Seventh Heaven. Mana possesses a natural talent for hacking and previously used these skills to assist her father in gathering information for his work. However, she is deeply reluctant to rely on her abilities because she blames herself for the events that led to her father's disappearance. Despite her technical aptitude, she is characterized by a naive and gentle personality, which has been noted as reminiscent of Saya before she lost her memories. Within SIRRUT, Mana forms a close, sisterly bond with another member named Tsukiyama. She is also the most persistent member of the group in attempting to build a friendly connection with Saya, showing a warm and earnest desire to befriend her. Over the course of the story, Mana's role involves grappling with her guilt and hesitancy while contributing to SIRRUT's mission through her hacker skills when she eventually chooses to use them. Her development centers on overcoming her self-blame and finding the courage to actively participate in the fight, serving as a relatable human counterpart to the supernaturally powered Saya.