Rei goes to Akane?s to apologize for squashing a tomato during her last visit. She?s convinced to stay for dinner and the girls begin to bond, much to Akane?s delight. However, Rei?s intent isn?t to start a relationship, but to bring it to an end.
One morning, Akane sees her classmate, Rei Kuroki, playing with some birds. Akane and the girls invite Rei to join their group for summer classes. Meanwhile, Kenjiro and Shijou realize it?s possible the Alone are being controlled by a third part
With the Izu Oshima Branch School destroyed in the Alone attack, Akane, Aoi and Momo are transferred to the New Oshima Academy on Blue Island. Akane, worried that she?ll be late on her first day, transforms into her Palette Suit and flies to school.
Rei is taken away by the UDF, her accusation still ringing in Akane?s ears. While Kenjiro begins to delve in the mystery of her identity, the girls visit her apartment and contemplate the likelihood that they?ll never see Rei Kuroki again.
Akane is rushed to the hospital, leaving the three girls to fight the revived Alone without the ability to dock. The creature wraps itself in a cocoon, allowing them time to evaluate the few options they have; at the same time, Rei waits for the Alone to emerge.
Due to her battles against the Alone, Akane?s performance at school is slipping and with her proficiency test coming up, she?s being threatened with extra classes. The girls decide to have a study group to help her catch up, and invite Rei to join them.