As instructed by Raymond, one of the Seven Sages, Tatsuya and his friends head to the outdoor training area behind First High School on the night of February 19th. Just as Raymond said, they detect the presence of all active parasites and Lina gathering at the scene. At this rate, clashing with Lina, who is hell-bent on completing her mission as Sirius, will be inevitable. With complex emotions at play, the final battle with the parasites begins.