A thrilling forbidden romance based on the VOCALOID song "Cantarella" featuring Hatsune Miku and KAITO! Cesare, the eldest child of the notorious Borgia household in fifteenth-century Italy, learns he has a sister he's never met―Lucrezia.

He is also given a poison called "Cantarella," which has been handed down in the family for generations. The story unfolds after Cesare (here played by Kaito) meets Lucrezia (Hatsune Miku) for the first time…