The girls are attacked by a dangerous new type of enemy while trying to protect their Wonder Eggs. Acca and Ura-Acca may have a solution, but Ai is more concerned with the budding relationship between her mother and Mr. Sasaki.

Ai, Rika, and Neiru confront Acca and Ura-Acca, but are distracted by shocking news from Momoe. Later, Momoe confronts her toughest battle yet while Ai makes a difficult decision.

The girls realize that there's more waiting for them at the end of missions than they bargained for. As doubts pile up and tensions rise, Ura-Acca decides to tell Ai his story.

Friendships are tested as Ai and Neiru realize how much "victory" has cost Rika and Momoe. Ai decides to fight again in spite of what she's learned, but the girl who emerges from her Egg this time may be more than she bargained for.

Ai, Neiru, Rika, and Momoe have all cleared the game, but what awaits them isn't quite what they hoped for. With their long battles behind them, what future will each girl choose?