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?

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?