A unit formed by Shen, who grew up in Hawaii, and Micro, from Tokyo. Their first album Def Tech, which includes the song My Way, was released in 2005 and sold over 2.8 million copies, breaking indie sales records. In the same year, they became the first indie artists to perform at NHK’s Kouhaku Uta Gassen. In 2020, they made their first appearance on YouTube’s THE FIRST TAKE, surpassing 50 million views and continuing to gain more. This year, 2025, marks their 20th debut anniversary. On March 28, they will digitally release a new song titled Child in me. A special 20th-anniversary live concert will be held on June 29 at Pacifico Yokohama National Convention Hall.