These are the ones I can think of off the top of my head... ^^;
Ayu- RAINBOW/MY STORY
Koda Kumi- Black Cherry
Utada Hikaru- ULTRA BLUE
B'z- MONSTER/ACTION
YUI- Can't Buy My Love
alan- Voice of EARTH
Namie Amuro- BEST FICTION
GIRL NEXT DOOR- GIRL NEXT DOOR
Meisa Kuroki- ATTITUDE (My favorite is still MAGAZINE)
GACKT- Mars (Best album to date!
)
Leah Dizon- Destiny Line
Porno Graffitti- ∠TRIGGER (I had been a fan since about 2008-2009, thanks to ayu performing Saudade, but I count this as my first album.)
SPYAIR- Rockin' The World
BREAKERZ- FIGHTERZ
Kobukuro- CALLING