After catching the girls listening at their room while Ichika is massaging her, Chifuyu has a pep talk with the girls about their feelings for her brother and gives them some advice. The next day, Tabane arrives in person to deliver the Akatsubaki, a fourth generation model with abilities far more advanced than the other models, and Houki gives it a test run. However, Chifuyu soon receives news from Maya that an unmanned IS developed by the United States and Israel called the Silver Gospel has gone out of control. After assessing the situation, Chifuyu orders the group to stop it, while Ichika and Houki will pursue it; as the only two people with fourth generation models, they would be fast enough to catch up with the Silver Gospel.