Learning that island of Delos has been taken over by Neuroi, Charlotte E. Yeager and Francesca Lucchini are teamed up with Hanna-Justina Marseille and her partner Raisa Pöttgen to draw out the Neuroi hiding within it. Francesca, who has strong family ties with Delos, objects to their superior's plan to destroy the island, so they work out a new plan to have Hanna and Raisa draw out the Neuroi while Charlotte and Francesca drop bombs on it. When this plan ends up failing, Francesca tries to attack on but is inevitably forced to retreat...