Summary:
A girl who after an incident forgets her own name has her life changed when a Robotic Oni attacks her school and kills everyone she loves. During the attack her best friend Stephanie disappears in a cloud of purple butterflies and she soon finds out that she is actually the sister of Kaito, Kaiko. Through certain situations she goes with Kaito back to his world and lives there. While she does, things that never should have been found out pop up and someone is watching from the shadows. Waiting, to strike down the relationship between Kaiko and Kaito.
Things that YOU need to know:
Also the main character lives in a world that's just like ours. Vocaloids are just virtual idols nothing more. But there is a dimension where they do exist. That's where Kaito, Gakupo and etc. live.
Vocaloids: is a singing synthesizer application software developed by the Yamaha Corporation that enables users to synthesize singing by typing in lyrics and melody.
They use singer's voices twist them around and make them more robotic and use characters to represent the new voices.
NEL: Its the energy of a person. Each Nel has its own color and only vocaloids have NEL
If you have anymore questions. Ask me