Kokone

kokone (心響) is a Japanese VOCALOID developed and distributed by Internet Co., Ltd., and was released in February 2014 for the VOCALOID3 engine. Her voice provider has not been revealed, but is confirmed to be based on a new vocalist.

Etymology
Her name means "heart sound". It may also derive from "心に響く", a verb phrase that literally means "to echo in the heart" and means "to leave an impression on the heart/emotions".

Marketing
Prior to her release, INTERNET Co held an illustration contest in celebration of kokone's release. The contest ended on March 17, 2014.

Trivia

 * Her release date was Valentine's Day, which complements the meaning of her name: "heart sound".