Taka was born on April 17, 1988, the eldest son of famous Japanese singers Mori Mori and Mori Shinichi. He has two younger brothers named Moriuchi Tomohiro who works on TV Tokyo, and Moriuchi Hiroki who is the lead singer of the band My First Story.
Moriuchi signed with Johnny's Entertainment in 2002 and joined the boy band, News, in 2003. He was briefly in a cover band called Chivalry of Music in 2004, consisted of a keyboardist, a guitarist, and him on vocals.
Taka was invited by guitarist Toru to join One Ok Rock in 2005. The band released their first independent CD in 2006 and was signed by Amuse, Inc., with whom they made their major debut.
The band did moderately well with music sales until they hit with major success in August 2012 upon the release of "The Beginning", which was the theme song for the live-action movie adaption of the manga and anime, Rurouni Kenshin. The band's concerts have been sold out many times with high attendance and constantly adding new tour dates in Japan. ONE OK ROCK has also held concert tours overseas in Asia, U.S., Europe, and South America.
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