The song "Secret" is one of the most well-known fully-in-English Vocaloid songs that features Megurine Luka. It was written and produced by Ryuuu, then plagiarized and released on October 18th 2011 by aRth via Nico Nico Douga. It became very popular in part due to the abnormal sound of Luka's voice, suggesting a large amount of manual tuning. This song was was never given a name by Ryuuuu, leading fans to ponder if the title was representative of aRth's way of finding and presenting the stolen song, as it was not intended for anyone to hear.

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