The Yotsuba Family intervenes to eliminate all threats to Tatsuya from the USNA military forces. The only threat that remains are the parasites. After questioning Pixie about the remaining parasites, Tatsuya heads to Aoyama Cemetery with Miyuki and Honoka to lure them out.

Thanks to Pixie's psychic powers, Tatsuya and his friends are finally able to capture the parasites. They leave the scene after Erika and her team arrive, but a third faction disguised as the police appear before them and get in their way.

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.

About a month after the parasite incident, Tatsuya and his friends reluctantly bid farewell to Mayumi, Mari, Katsuto and the other seniors at the 29th graduation ceremony at First High School. The time also comes for them to give a send-off to another friend who came from America.

Tatsuya and Miyuki are invited to a party to commemorate the completion of Japan's first hyper-building offshore tower, there Hayama introduces a young girl called Sakurai Minami. The two are shaken upon seeing her face which is that of a woman who died in an incident three years earlier. At such a time, there is intelligence that the party is being targeted by extremist magic advocates — The Advancement of Humanity Front.