F9

F9 (pronounced "ef-nine") originally debuted as a Nico singer under the name Kiyono in the summer of 2007, and mostly sang covers of Sound Horizon songs. For some reason, she deleted all of her videos, and decided to start anew. On March 31, 2008, not expecting to cause any commotion, she uploaded a cover of minato's Soar with a simple description pointing to the original song. The video quickly rose to the #1 spot in the music rankings (there was no "utattemita" category back then), and minato himself wrote a blog post detailing how he was overwhelmed with feeling by F9's voice. People were wondering who exactly this "pro-like" singer was, but since she left no trace of a name or MyList, nicknames such as "The Nameless Songstress" or "The Songstress of Soar" were thrown around often. In the end, she was unofficially called "F9", which was the uploader account's name. Her identity was finally revealed in February 2009, where it was announced that F9/Kiyono will participate in a live concert. She states that she doesn't mind being called by both names, but typically uses F9 within NND, and Kiyono for outside work.