"ana", as the character is called, was created using Zero-G Ltd's Vocaloid software, and specifically the "Lola" voice.
They were first introduced to the Vocaloid software after the introduction of first Vocaloids (Lola and Leon) from the British studio Zero-G at the NAMM Show on January 15, 2004 and were later recommended to Yamaha Corporation by Crypton Future Media.
The company also develops singing synthesizers using the Vocaloid engine developed by Yamaha Corporation.