Dear Stage is an idol company.
Moe Japan/Dear Stage are the developers of the VOCALOID3 Tone Rion. Moe Japan/Dear Stage came up with the concept of a "VOCALOID you can meet" the "fusion of a 2D VOCALOID and a 3D idol": Vocaloidol. Real idols from two different companies, MOGRA and Dear Stage, were to provide the voices of several Vocaloids. Alongside this, events would feature "Real VOCALOIDs" for fans to meet.
The group was called "Vocaloidol" after "VOCALOID + idol". Tone Rion was the first of a group of 5 products that were originally planned.