Ai Ishigaki was the guitarist for The Mad Capsule Markets (MCM) from 1990 to 1996. He got the job as support guitarist after being a roadie for MCM in the Berrie days. Ishigaki debuted on their Thrash-Punk album P.O.P, “It was a whirlwind experience—I went from hanging around with bandmates after school to debuting professionally within months,” he told Visual Music Japan (VMJ) in an interview with Mandah Frénot.