桜哉

A.D. 2XXX.

As the mechanisation of lifestyles progressed, humans and robots coexisting with one another had become a normality in this period of Japan.

Sakuya, an android with a sense of self and emotions near-completely human, was born thanks to the protagonist Kujou Akane's now-deceased father's research. She had lived with Sakuya for ten years, and never doubted that their bond was anything other than "familial".

However, one day... Akane receives a business offer relating to Sakuya from her childhood friend who she hadn't seen in a while, Uemura Shin. From that day onwards, changes in her relationship between herself and Sakuya begin to become apparent...