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On 5th August 2011, their first VOCALOID was confirmed to be named Aoki Lapis. A voice recording competition was held to find the voice provider. Aoki Lapis was released on April 6, 2012.
i-style Project announced on the 7th April 2012 that they are making another Vocaloid who is female and will be Lapis's sister of some sort. A competition was done to choose her name, which was decided as Merli.
Merli, their new Vocaloid was revealed as Lapis' older sister with dark character-themed, as Lapis's exact opposite. August 2012, i-style Project started an open recruitment for a voice provider for Merli; the deadline of the recruitment was set on September 10, 2012, but was the changed to November 30th, 2012.