Mysterious voices lead 14-year-old Ai Ohto to a strange Wonder Egg, promising her a chance at what she wants most.

Ai meets Neiru, a girl who is buying Eggs. At first, she's given the cold shoulder, but that could change after the next time they crack their Eggs.

While buying Eggs for herself and Neiru, Ai meets Rika, a former idol who is also buying Eggs. Rika quickly pushes her way into Ai's life.

With Rika out of action, Ai is on the run and struggling to protect two girls from a devious killer. A fourth child is also fighting to protect the girls in the Eggs.

Ai, Neiru, Rika, and Momoe quickly become close friends as they continue to protect Eggs, but questions pile up and tensions rise.

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