I think it is, and the other people are like session musicians.
(like temporary musicians or something)
I took this from the official site:
Acid Black Cherry Project Member
SPELL MAGICrecording musician
Guitar:SUGIZO
Bass:SHUSE
Drums:KOZO SUGANUMA
2007.5.6～6.10 secret live musician
Guitar:YUKI(DUSTAR-3)
Guitar:AKIHIDE(BREAKERZ)
Bass:SHUSE
Drums:MAKOTO
2007.7/15, 7/18, 7/21 free live musician
Guitar: 千聖(PENICILLIN)
Guitar:AKIHIDE(BREAKERZ)
Bass:SHUSE
Drums:淳士
SPELL MAGIC music clip musician
Guitar: 千聖(PENICILLIN)
Guitar:AKIHIDE(BREAKERZ)
Bass:SHUSE
Drums:淳士
2007.8.12 SUMMER SONIC 07【OSAKA】 live musician
Guitar : 千聖(PENICILLIN)
Guitar : AKIHIDE(BREAKERZ)
Bass : SHUSE
Drums : 淳士
Black Cherry recording musician
Guitar : YUKI(DUSTAR-3)
Bass : SHUSE
Drums : KOZO SUGANUMA
Horn Players: ピストルバルブ
Black Cherry music clip musician
Guitar : 千聖(PENICILLIN)
Guitar : AKIHIDE(BREAKERZ)
Bass : SHUSE
Drums : 淳士
Horn Players: ピストルバルブ
2007.10.29～11.4SWAPPING ROCK PARTY! live musician
Guitar : 千聖(PENICILLIN)
Guitar : AKIHIDE(BREAKERZ)
Bass : SHUSE
Drums : 淳士
愛してない recording musician
Guitar : AKIHIDE(BREAKERZ)
Bass : SHUSE
Drums : KOZO SUGANUMA
冬の幻 recording musician
Guitar : AKIHIDE(BREAKERZ)
Bass : SHUSE
Drums : 淳士
冬の幻 music clip musician
Guitar : AKIHIDE(BREAKERZ)
Bass : SHUSE
Drums : 淳士
2008.03.06～04.24 live house tour musician
Guitar：YUKI(DUSTAR-3)
Guitar：AKIHIDE(BREAKERZ)
Bass：SHUSE
Drums：淳士
2008.05.02～05.23 hall tour musician
Guitar：YUKI(DUSTAR-3)
Guitar：AKIHIDE(BREAKERZ)
Bass：SHUSE
Drums：淳士
BLACK LIST recording musician
「sins」
Guitar
AITA
Bass:SHUSE
Drums: Kozo Suganuma
Strings Arrangement:林保徳,Tatsuya Murayama
Strings:Murayama・kiriyama strings
Piano:Satoshi Mishiba
Keyboards & Programming:林保徳
「少女の祈り」
Guitar
AITA
Bass:SHUSE
Drums:淳士
Keyboards & Programming：kiyo,林保徳
「scar」
Guitar:SUGIZO
Bass:SHUSE
Drums:Kozo Suganuma
Strings Arrangement:林保徳,Tatsuya Murayama
Strings::Murayama・kiriyama Strings
Additional Guitar: Noriyoshi Matsushita
Keyboards & Programming: Noriyoshi Matsushita,林保徳
「Bit Stupid」
Guitar: YUKI(DUSTAR-3)
Bass:SHUSE
Drums：淳士
Keyboards & Programming：kiyo,,林保徳
「楽園」
Guitar: YUKI(DUSTAR-3)
Bass:SHUSE
Drums: Kozo Suganuma
「Murder Licence」
Guitar: YUKI(DUSTAR-3)
Bass:SHUSE
Drums:淳士
Keyboards & Programming：林保徳
「DRAGON CARNIVAL」
Guitar: YUKI(DUSTAR-3)
Bass:SHUSE
Drums:淳士
Keyboards & Programming:林保徳
「Prologue End」
Guitar: AKIHIDE(BREAKERZ)
Bass:SHUSE
Drums:淳士
Strings Arrangement:林保徳,Tatsuya Murayama
Strings:Murayama・kiriyama strings
Piano:Satoshi Mishiba
Programming: Noriyoshi Matsushita,林保徳
20+∞Century Boys recording musician
Guitar : DAITA
Bass : SHUSE
Drums : KOZO SUGANUMA
Keyboards & Programming：林保徳
20+∞Century Boys music clip musician
Guitar : YUKI(DUSTAR-3)
Guitar : AKIHIDE(BREAKERZ)
Bass : SHUSE
Drums : 淳士
2008.10.30 NIGHTMARE OF HALLOWEEN live musician
Guitar : YUKI(DUSTAR-3)
Guitar : AKIHIDE(BREAKERZ)
Bass : SHUSE
Drums: 淳士
ジグソー recording musician
Guitar : YUKI(DUSTAR-3)
Bass : IKUO
Drums : KOZO SUGANUMA
ジグソー music clip musician
Guitar : YUKI(DUSTAR-3)
Guitar : AKIHIDE(BREAKERZ)
Bass : SHUSE
Drums: 淳士