Studio details
| Name | Circle Σ |
| Alias | Circle sigma, サークルシグマ |
| Lang | 
Japanese |
| Type | Amateur group |
More information (External pages)
| Other links | VNDB Profile VNStat |
| Name | Circle Σ |
| Alias | Circle sigma, サークルシグマ |
| Lang |
Japanese |
| Type | Amateur group |
| Other links | VNDB Profile VNStat |
