While Riki Naoe goes to the classroom to pick up a Japanese lit notebook at nighttime, he is approached by Saya Tokido, who urges him to flee. After he hears a distant gunshot, he finds her abandoned student handbook left in the classroom. On the next day, Riki returns the student handbook back to Saya, who invites him on the school roof. She claims that the "Darkness Executives" may capture and interrogate him and may discover her identity. When Saya pushes Riki off the school roof, Masato Inohara appears outside below...