With X Japan's popularity increasing, Yoshiki and the band collaborated with Mugen Motorsports and sponsored racer Katsumi Yamamoto, who drove for team "X Japan Racing" in the 1995 season of Formula Nippon. In the 1996 season, they sponsored Ralf Schumacher with both him and the team winning the championship. In 1997, Toshi decided to leave the band, claiming the success-oriented life of a rock star failed to satisfy him emotionally. The band's dissolution was officially announced in September 1997. X Japan performed their farewell show at the Tokyo Dome on December 31, 1997, making it the last of five consecutive New Year's Eve shows in that stadium. Soon afterwards, in May 1998, the band's lead guitarist Hide died, and Yoshiki withdrew from the public scene, as he was battling suicidal thoughts and eventually sought the help of a psychiatrist.