F9

F9, also known as Kiyono (きよの), is an whose voice is often described as crystal clear. She is able to hit high notes, as well as maintain good control and balance of her voice. She first debuted under the name "Kiyono" in the summer of 2007, and mostly sang covers of Sound Horizon songs.

Her first cover of a VOCALOID song, in March 2008, was a cover of "Soar". The video quickly rose to the #1 spot in the music rankings (The utattemita category did not exist at the time), and minato himself wrote a blog post detailing how he was overwhelmed with feeling by F9's voice. People at the time wondered who this "pro-like" singer was, since she left no trace of a name or Mylist, and users tagged her videos with "yasei no pro" (野生のプロ, lit. a wild pro appeared). Thus, nicknames such as "The Nameless Songstress" or "The Songstress of Soar" were often used. In the end, she was unofficially called "F9", which was her account username. "Soar" remains her most popular cover to this day, with over 653K views and over 21K Mylists.

Since then, F9 has uploaded songs from various genres, ranging from Yuyoyuppe's screamo-rock to 's ambient and relaxing tunes. For unknown reasons, she decided to delete all of her old videos and start anew. She has went on hiatus starting in mid-2011 until early 2013, at which time she returned with a cover of "Boei Honnou", signaling her comeback to the utattemita scene after two years.

Trivia

 * Her identity was finally revealed in February 2009, where it was announced that F9/Kiyono will participate in a live concert.
 * F9 stated that she doesn't mind being called by both names, but typically uses F9 within Nico Nico Douga, and Kiyono for outside work.
 * She uses an Audio Technica ATH-4050 microphone, Focusrite Saffire6 and Sonar6 LE.
 * She was born in Aichi Prefecture.