Detective Sagisaka Minoru works in Shinjuku's Intervention Department, investigating serial murders potentially linked to the supernatural. Partnered with Narumi Kure, their dynamic mirrors *The X-Files*, with Sagisaka embodying the believer in paranormal forces. His drive originates from personal tragedy: his daughter, Yoshiko Sagisaka, survived a mass murder by a mikura (a mechanized demon). Witnessing the attack led to her institutionalization when authorities dismissed her supernatural account. Sagisaka dedicates himself to proving these entities exist to vindicate her. During their investigations, Sagisaka and Kure encounter Hinaru, another mikura attack survivor. Hinaru's experiences reinforce Sagisaka's convictions, highlighting the human cost of Shinjuku's supernatural conflict. Sagisaka's story culminates when he, Yoshiko, Kure, and Hinaru shelter during Eko's assault on Tokyo. The police chief transforms into the mikura Ushi-oni and attacks. Recognizing Ushi-oni as his daughter's attacker, Sagisaka sacrifices himself, pushing Yoshiko to safety and dying in the process. His death becomes the catalyst for her recovery from catatonia. Sagisaka Minoru's character reflects themes of human vulnerability and familial devotion within the supernatural conflict, offering a grounded perspective.