B'z PARTY is the official fan-club for B'z. Membership requires a Japanese address and payment through Japanese payment services, making it difficult for international fans to join without local assistance.
The biggest draw for joining the fan-club is premiere access to upcoming LIVE-GYM tours. Members enjoy priority booking of tickets as well as access to exclusive front-area seating reserved entirely for fan-club members. Due to the many thousands of members, the exact placement of a ticket takes place via a lottery that is decided before the general sale for a given venue, giving fan-club members twice as many chances to score their desired tickets for a given show.
Members of the fan-club also enjoy special privileges and have access to items and information prior to their release to the public, as well as exclusive items never made available through retail channels. All members are given a membership card with their name, as well as receiving greeting cards throughout the year for their birthday, summer, and Christmas. Cards always feature new imagery not included for previous year's editions. Additionally, a special New Year's video appears on the site every year on January 1 for fan-club members. The brief video includes a greeting from the two members as well as mentions of their plans for the upcoming year.
The fan-club magazine Be With! is also exclusive to members of B'z PARTY. The quarterly magazine ships in March, June, September, and December of each year, and generally features a new interview with B'z, new photos and reports on their activities, and various behind the scenes looks at the inner-workings of the band and their releases. Members also gain access to the B'z PARTY website, which includes exclusive information as well as a special B'z PARTY store. The store includes back catalogue issues of the fan-club magazine as well as the ability to reserve and purchase the annual editions of the special monthly and weekly calendars.
Additionally, for each large-scale LIVE-GYM the band carries out, members of the fan-club are given the opportunity to win exclusive passes to a very limited Meet & Greet with the band before the show. One such Meet & Greet event can be witnessed in the band's 2002 concert documentary film a BEAUTIFUL REEL. B'z LIVE-GYM 2002 GREEN ~GO★FIGHT★WIN~.
In 2018, as part of the band's thirtieth anniversary, B'z PARTY Presents B'z Pleasure in Hawaii was organized as a limited opportunity, fanclub-exclusive event to follow B'z LIVE-GYM Pleasure 2018 -HINOTORI-. The event included two concerts just for members as well as a talk put on by the band.