Based on the popular Vocaloid song
Alluring Secret ～Black Vow～
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Rin, a young angel (presumed female, but angels dont have clear genders) falls in love with a young human girl, Miku. However, their love is considered taboo, and so, Rin makes a deal with the devil to be reborn as the human boy, Len, in order to be with Miku. However, their happiness together is short-lived, and even that soon ends in tragedy.
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