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 is slacking off now that Yuyu has accepted her. Yuyu asks Riri to form a legion to keep her active, expecting her to fail. But when Riri starts actually recruiting members, Yuyu may be in for more than she bargained for.

Riri finds a mysterious girl in the remains of a dead Huge. The amnesiac girl quickly grows attached to Riri, who devotes herself to taking care of her. But just who is this girl, and how will Riri's legion deal with her absence?

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?

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?