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She is the first CeVIO released by a 3rd party developer/publisher. She was introduced on January 24, 2015, during the "IA Special Anniversary Livestream" event. On March 27, demos for her singing voicebank were released and it was announced that this voicebank would release on May 22, 2015.
In January 2015, she was introduced on 1st PLACE's CeVIO software page. The official 3D model was slated for free download on February 6 and it was created for the MikuMikuDance (MMD) program. She was made by mqdl, a 3D modeler.
To demonstrate her narration skills, she quoted humorous text featured with "Reaction Images" that are uploaded to the http://bokete.jp website.
To match with her older sister, IA, ONE carries the "sexy punk look." Her hair on the front is rather short with a orange tint on the ends, with some hair spreading out on the top. Like IA's two braids on her side, ONE has a matching braid for the bottom. She has a "sporty" look with a white top under a orange zipper-up tank top. ONE has what it looks like being a skirt like shorts with a messy white belt. On her left leg, there is a tattoo, with the same being on both sides, being black and orange. ONE right leg has a long black sock with the other side having a under-knee black sock with 3 white lines going across. Her shoe looks like hiking shoes, with a orange touch with black laces. On the the front of ONE's shoes are black, with the bottom being orange.