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.

Riri's newly formed legion goes to watch an experienced legion fight to study teamwork. The Huge they're fighting, however, is more than it seems, and Riri and Yuyu's bond will be tested like never before.

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.