CUL was a model designed for the show VOCALO Revolution, organized by Hiroto-P. Modifications are ONLY allowed in terms of improving the appearance or changing colors for personal use, however, she MUST not be modified into entirely different character nor are parts allowed to be used on other models. Redistributions of this model are forbidden.
Her variant is Dark/Black CUL, who has a darker color palette.
A related model named REV has the same premise and uses VY2's voice.
She previously used the Vocaloid VY1's voice to sing songs, and was featured on the show in a beginning, ending, and presentation PV. The character design is by Lat.
On June 8 2011, Yamaha announced that CUL would be a real Vocaloid with the voice provider Eri Kitamura. The publisher will be INTERNET Co.,Ltd.