Sing a Bit of Harmony

The story follows high school student Satomi Amano, who lives with her mother, Mitsuko Amano, a Hoshima-employed AI specialist. After a past incident, Satomi is isolated at school, shunned by her classmates, and estranged from her childhood friend, Tо̄ma Suzaki. Her mother is preparing a secret test of a newly developed AI system, which is supposed to be indistinguishable from humans. In this test, the AI is to spend a few days in Satomi’s class in a realistic looking robotic body as exchange student Shion Ashimori. Shortly after having been introduced to the class, Shion surprises everyone by recognising Satomi, asking her whether she is happy, and breaking into song. In the following days, Shion is bent on making Satomi happy. She helps Satomi find friends, helps these friends with their own problems, and goes on to fix Satomi’s relationship to Tōma, all with the power of song. Meanwhile, it becomes clear that someone mysteriously manipulates the recordings of the school’s security system and Shion’s telemetry results to hide Shion’s unconventional behavior from Hoshima. When the company eventually gets wind of this, Shion is violently taken in and prepared for deletion, and all the devices containing footage and memories of Shion are seized. Following the discovery that Shion is a modified AI gifted to Satomi by Tо̄ma when they were children, Satomi, Mitsuko, and her friends decide to rescue her, and break in to Hoshima. They are confronted by Hoshima’s security, but Satomi and her friends take Shion to the roof of the building, where Tо̄ma links Shion to the building’s antenna. Shion uploads herself to a satellite. Encouraged by Shion, who is watching over Satomi from orbit, Satomi and Tо̄ma reconcile.