Where exactly does the Vtuber work come from?

This is the first original song by Satosato no Satosato (Chikasato Yoha and Kitsunosato Takenoko).
This original song was written and arranged by Chikasato Yoha, a personal Vtuber, and illustrated by Kitsunosato Takenoko, also a personal Vtuber, who was in charge of the illustration video 3D modeling.