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Rin and Len are turning ten! Ten years ago, the voice banks for Kagamine Rin and Kagamine Len were first released, and have been utilized by many since, to cover songs and create original songs. They were initially going to be released as officially twins, but then people starting making fan art of them being shipped, so, since siblings being in a romantic relationship is gross, the decision was left up to the fans. In spite of the controversy, the fans accepted the "mirror images" enthusiastically, and they are still cherished by the fandom to this day. In honor of their tenth birthday, I decided to cover Alluring Secret ～Black Vow～, by Hitoshizuku-P, using Rin and Len, with Miku singing backup vocals. I sang this song because I had initially wanted to cover Electric Angel, but then I realized that since it was actually originally sung by Miku, it would be kinda mean to cover that as opposed to an actual Rin and Len song, so why not this one?
