Tetsuya also performs backing vocals in L'Arc-en-Ciel and has composed many of the band's songs, including "Link", "Ready Steady Go", "Finale", "Driver's High", "Stay Away", "Pieces" and "Good Luck My Way".

In February 1991, bassist Tetsuya (then known as "Tetsu") recruited vocalist Hyde, guitarist Hiro and drummer Pero to form a band named L'Arc-en-Ciel.

In 1994, L'Arc-en-Ciel signed a contract with Sony Music Entertainment Japan's Ki/oon division and released their major debut album Tierra that same year.

It features former Zi:Kill and Die in Cries drummer Yukihiro as a support member.

Sakura officially announced his departure from L'Arc-en-Ciel on November 4, and the band held their first concert back at the Tokyo Dome on December 23, 1997, entitled Reincarnation.

It was the band's first performance at the venue and had an attendance of 56,000 people, with the tickets sold out in a record-breaking four minutes.

In 2003, L'Arc-en-Ciel were ranked number 58 on a list of the top 100 Japanese pop musicians by HMV Japan.

[6] On April 1, 2023, Tetsuya announced the formation of a L'Arc-en-Ciel cover band called Like-an-Angel (also written as "Like〜an〜Angel" or "Like-ən-Angel").

"[7] The other members, vocalist Jekyll, Vivid guitarist Reno and Matenrou Opera drummer Hibiki, were not revealed until their first concert at Daikanyama Unit on May 30.

[9] Like-an-Angel held their first tour between September and October 2024, with former L'Arc-en-Ciel drummer Sakura sitting in with the band for "I'm So Happy" at the final show.

[13] Tetsuya launched his own musical equipment brand Stella Gear in 2023, but retains a relationship with ESP.