This is so cool!

According to Hanabusa, the mastermind behind the projection, this is done by projection onto a screen, perfecting alignment with the dancers through repeated practice. The dancers in the video come from different backgrounds. For example, Maki Yokoyama is trained as a rhythmic gymnast as well as in various forms of dance. This may help her achieve precision movement. The other performer, Saya Watatani, is a ballerina who has also studied theatre.

The youtube channel of Nobuyuki Hanabusa is here:
   / papanda87  

More information: director Nobuyuki Hanabusa, animator Seiya Ishii (with Nobuyuki Hanabusa), and performers/choreographers Saya Watatani and Maki Yokoyama