After the Witches discovered that the Neuroi were capable of communicating with humans and negotiated peace with the nest above Gallia, they set out to re‑establish contact. However, a sudden attack wiped out the Neuroi, and the Witches then uncovered a new, massive nest that had appeared overnight, covering almost all of Europe. This ruthless nest annihilated allied forces and many Witches. News of the attack reached Fuso, prompting the deployment of a support battalion to rescue survivors. Among the rescue team were former Striker captain Mio Sakamoto and civilian Yoshika Miyafuji, both determined to save their dear friends.