十三番目の黙示録 (Juusan-banme no Mokushiroku)

Background
The thread of fate twists and tangles...

Based on the Sleeping Beauty tale, the song is featured in Hitoshizuku-P and Yama△'s album If the World 2 which includes songs based on fairytales. It was released on December 26th, for the Kagamines' seventh anniversary.