709sec. is an arranger and vocalist that has released many songs as part of the doujin circle SOUND HOLIC. He is best known for his rock arranges and occasional english tracks.
He debuted in the 2008 album 永 -TOKOSHIE- with the song Night Bird. He has since released several full vocal albums under the label SOUND HOLIC feat. 709sec. beginning with Wind Gazer. He has also contributed at least one song to every SOUND HOLIC Full Vocal album since his debut.
The 2009 song Draw the line was his first to receive a promotional video.