The group signed a record deal with BMG Japan but disbanded in 2004 and Takumi decided to pursue composing and producing full-time.

In Asia, he has written and arranged songs for major recording artists Exile, Daigo, Da Pump, Cute, AAA,[15] Shiritsu Ebisu Chugaku (Japan),[16] Kara, and FT Island (South Korea), among others.

[17] Takumi also composes and produces music for numerous anime TV series such as Claymore, Witchblade, Peach Girl, Genshiken, and Koi Kaze.

[1] He was an associate producer on Stewart Copeland and Ricky Kej's 2023 album, Police Without Borders and was selected for Newsweek magazine's "100 Most Respected Japanese People in the World.

"[23][24] Also in 2023, Takumi was invited by the United States Ambassador to Japan, Rahm Emanuel, to the U.S. Embassy in Tokyo, where he performed live.