Yurigaoka holds a school-wide competition to choose the year's best Lily. Riri worries that the inexperienced Yuri could get hurt in the games, but with spies swarming outside the school grounds, that could be the least of her worries.

When Yuri's origins are revealed, she is classified as a Huge. Riri flees the academy with her, but orders are issued for their capture. What will the other Lilies choose when ordered to hunt one of their own?

Riri is confined for a week as punishment for insubordination and sinks into depression over Yuri's death. The other members of her legion look for her missing hair tie, hoping to cheer her up, but will it be enough?

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?