GUYZ is actually a Korean band which had been flying under the radar since 1998.
The thing that makes them intersecting is that although they are Korean, they have that typically J-Rock feel about them (note the difference between J-Rock and Visual Kei). They have also expressed interest and are attempting a break into the Japanese market.
GUYZ has released at least 6 singles and appeared on OST tracks for a few animes’, such as BLEACH and the popular drama 101st Proposal.