WATARAI became interested in scratching during junior high school and began DJing at clubs, mainly in Roppongi, a few years later. He was shocked by an interview with PETE ROCK broadcast on MTV in 1995 and started producing tracks. Afterwards, he continued his energetic activities, focusing on works by MURO and Nitro Microphone Underground, and also provided music to R&B artists such as MISIA, DOUBLE, and AI. He currently works as a regular DJ at Shibuya HARLEM's "Punch Out!!!".