Riri is determined to get Yuyu to agree to be her Schutzengel and find out what changed her, but Yuyu won't even talk to her. Riri works out her feelings as she learns her way around Yurigaoka Academy.

As Riri and the others continue to grieve, Yuyu isolates herself, tormented by visions of Misuzu. As the Huge attack Yurigaoka as they never have before, Yuyu is forced to question the truth of her relationship to her late Schutzengel.

The most powerful Huge yet is attacking Yurigaoka, and Riri is the only one left who can fight! Can Yuyu overcome her past in time to join her? And what can the other Lilies do against an enemy that disables their weapons?