Das Forschungszentrum wird von feindlichen Kräften versperrt. Zu Hause erfahren Yukina und die anderen von den Efidolg und Yukinas vermisstem Vater Takehito.
Yukina, Kennosuke and all the others who escaped the attack on the research facility retreat to the school, which has become the new UN's HQ. The entire region is completely isolated from the rest of the world because of the barrier created by Efy Dolgh. That night, the Demon speaks to Kennosuke, Yukina and her mother, revealing to them how he met Yukina's father years ago, shortly before his death from a sudden avalanche. Meanwhile, the Efy Dolgh manage to excavate the hinge stone from the dam's excavation, using the parasited humans as slaves. The stone draws in surrounding heat, cooling the area and provoking a snow storm over Kurobe. Muetta, having finally accepted the fact that she's been cloned, and all of her memories are fake, escapes from the base. While she's searching for Muetta, Yukina collapses in the snow. When Muetta finds her, she and Yukina take refuge in an old house where they're reached by Kennosuke. Muetta reveals to them that the Efy Dolgh are planning to use the hinge stone to create a wormhole between the Earth and its homeland, to enable the main army to storm the planet and subjugate it.
Il nemico blocca il centro di ricerca. A casa, Yukina e gli altri ricevono istruzioni sull’Efidolg e sul padre di Yukina che è scomparso.
エフィドルグのシールドにより、黒部研究所が封鎖されてしまう。自宅に戻った由希奈たちは、改めてゼルから彼自身のこと、エフィドルグのこと、そして由希奈の父・岳人のことを聞かされる。
적군이 연구소를 봉쇄하고, 집으로 피신한 유키나와 무리들은 에피도르그와 유키나의 실종된 아버지 타케히토에 대해 알게 된다.
Wróg otacza Ośrodek Badawczy. Yukina i przyjaciele zdobywają więcej informacji o organizacji Efidolg i zaginionym ojcu Yukiny.
