In 2004, he made his solo major debut with "音色". Throughout his career, he has been consistently known as the "first" solo HIP HOP artist. Achieving the first-ever Oricon Weekly Ranking debut at number one for a HIP HOP solo artist with his 2nd album '愛・自分博', he also made history as the first Asian HIP HOP artist to appear on 'MTV Unplugged'. In addition to providing music and producing for various artists, he has hosted the music festival "908 FESTIVAL" since 2012. His contributions to the music industry were further recognized when September 8th was officially designated as "KREVA Day" by the Japan Anniversary Association in 2013.

In 2021, he digitally released a new album "LOOP END / LOOP START", which topped the Oricon Weekly Digital Album Ranking and the billboard JAPAN DOWNLOAD ALBUMS chart. Continuing his success, he held the KREVA CONCERT TOUR 2023 "NO REASON" with a special finale at Nippon Budokan, which was later released as a video. Moving forward, in April 2024 after becoming independent, he launched a new "educational entertainment" project titled 'KREVA CLASS -新しいラップの教室-' with Kenjiro Kobayashi as the scriptwriter and director. Celebrating his 20th solo anniversary, he embarked on a Billboard Live Tour in Tokyo and Osaka, followed by a series of projects announced on KREVA Day, including the exhibition and sale of his original lyrics and the release of his new album "Project K". The extensive KREVA LIVE 2025 "Project K Tour" covering 19 cities and 21 performances is set to further showcase his multifaceted talents as one of Japan's most prominent figures in the music industry, handling everything from songwriting and production to rapping and track-making.