The novel adaption of HitoshizukuP's "Himitsu ~Kuro no Chikai~ Alluring Secret ~Black Vow~" is about Rin, a young angel who falls in love with a young human girl, Miku. However, their love is considered taboo because of their gender and race, and so, Rin makes a deal with the devil to be reborn as the human boy, Len, in order to be with Miku. But their happiness together is short-lived, and soon ends in tragedy. Translated by : Gabriella