Cadaru was created in a labratory as part of a project. Jojia Kuraine, a fellow UTAU, was in charge of this project and ended up creating Cadaru. One day, the lab went into a kind of meltdown, ending up destroying many parts and UTAU's. Cadaru was found in one room and Jojia attached her headphones but these malfuntioned causing one of her eyes to change from Brown to Red. It also gave her a great sense of happiness and love. She is completly unaware that Jojia is keeping a huge secret from her.