While buying Eggs for herself and Neiru, Ai meets Rika, a former idol who is there for the same reason. Rika quickly pushes her way into Ai's life, but what lies beneath her cheerful and callous exterior?

With Rika out of action, Ai is on the run and struggling to protect two girls from the most devious killer she's faced yet. Meanwhile, a fourth child is also fighting to protect the girls in the Eggs.

It’s Rika's birthday, and the girls get together to celebrate. Rika, however, is focused on her troubled relationship with her mother, and those worries carry over into her next battle. Will she be able to overcome her inner demons in time?

The girls are surprised when Neiru invites them all to her house, and even more surprised to find out that she lives at her company. Is Neiru ready to be open about her situation, and how will the others take it if she is?

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.

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.