The girls have to deal with the aftermath of the Ouroboros attack. Their fighting power has been greatly reduced, and they soon find out that things are worse than they had feared when some of the members are corrupted by the darkness...

Elel feels down after being told off by Ramiel, who has turned to the dark side. Saya tries to make her feel better, but Ramiel makes another attack, and this time the Red World's world crystal is in her sights. Elel and the others set out to try to win Ramiel back.

After saving the four other worlds through the portals, the defenses around Seiran island are strengthened in anticipation of a final attack. However, events do not proceed as anticipated...