I've checked their official website, but they didn't include an email-address their, nor is there any reference to an official fanclub.
Is suggest you ask this question again in one of these Yahoo-clubs:
V6 Rulez - For those who is addicted to V6
[DLMURL="http://clubs.yahoo.com/clubs/v6sfantasyland"]V6's Fantasyland[/DLMURL] - Hottest V6 fanclub ever!
[DLMURL="http://clubs.yahoo.com/clubs/v6unofficial"]V6 Unofficial[/DLMURL] - This is a place for discussion about V6 Viva V6 - A great place for the real V6 fans kinki kids V 6 singers - Welcome to kinki kids and V6 club.
There's bound to be someone there, who has an answer for you.