“I’m bringing this child safely back to earth no matter what.”

Estella, an AI that works at space hotel Sunrise, is suspected of attempting to make the hotel crash into Earth. However, as Vivy interacts with Estella and gets to know her better, she begins to see a difference between the information given to her by Matsumoto about Estella. Meanwhile, someone takes control over the Sunrise hotel much quicker than what Matsumoto predicted. Amidst the confusion, Vivy investigates the cause of the situation in order to save the passengers and Momoka’s younger sister, Yuzuka.

“Nothing is more important than singing an amazing song…that will allow me to fulfill my life’s mission.”

Diva is astonished when she hears from Matsumoto that Vivy’s mission is to prevent a war between humanity and AIs. He also explains to Diva that his current aim is to stop Ophelia from taking her own life. Ophelia is a songstress AI who just finished an incredible performance during rehearsal. As a principle, AIs are forbidden from self-destruction, so Diva approaches Ophelia to prevent her from committing suicide.

“I fulfilled my promise, Diva.”

It has been five years since Vivy has returned and Diva has disappeared. Vivy is being exhibited at the AI museum, and is faced with her defect of being unable to sing. When Matsumoto appears before her again, she finds hope in taking part in the Singularity Project, but he informs her that the project has been completed.

“…My mission is to bring happiness to everyone with my singing.”

Vivy was the first AI to write a song with her own will. As the first AI to utilize her own creativity and being the AI that has had the most contact with humans in the one hundred-year journey, the Archive entrusts Vivy with a choice that will determine the survival of humanity. Vivy is almost crushed by the weight of this responsibility, but after being urged on by Matsumoto, who has been her partner for the last one hundred years, and seeing Dr. Matsumoto’s risk his life for everyone, she executes the Singularity Project in order to save humanity. Using this last chance, will she be able to fulfill her mission of bringing happiness to everyone with her singing?