Diva is Saya's younger twin sister and the main series antagonist, Diva is the greatest sworn enemy of the Red Shield. In 1833, Joel Goldschmidt discovered the mummy of an unknown creature that had two cocoons that react to human blood. Diva was born in 1833 from one of these two cocoons. As an experiment, Joel separated the twin girls, raising Saya as if she were his own daughter while Diva, who was given no name, was locked in a tower and given only the basic necessities to live by Joel's assistant Amshel.[1] In 1863, Saya discovers the girl locked in the tower and names her Diva. Twenty years later, Saya releases Diva from her tower so that she can sing at Joel's birthday party, however Diva murders Joel along with the rest of the people attending the party before fleeing the area
