<s>
is	O
a	O
massively	B-Protocol
multiplayer	I-Protocol
online	I-Protocol
role-playing	I-Protocol
game	I-Protocol
developed	O
by	O
Ponsbic	O
and	O
Square	O
Enix	O
.	O
</s>
<s>
It	O
is	O
the	O
sequel	O
to	O
Cross	B-Application
Gate	I-Application
,	O
a	O
Japanese	O
MMORPG	B-Protocol
from	O
2001	O
.	O
</s>
<s>
Yousuke	O
Saito	O
was	O
the	O
executive	O
producer	O
,	O
having	O
previously	O
worked	O
on	O
Star	B-Application
Ocean	I-Application
:	I-Application
Till	I-Application
the	I-Application
End	I-Application
of	I-Application
Time	I-Application
.	O
</s>
<s>
The	O
soundtrack	O
was	O
released	O
as	O
an	O
album	O
through	O
Kikuta	O
's	O
Nostrilia	O
label	O
with	O
the	O
title	O
Concerto	O
:	O
The	O
Extraordinary	O
World	O
of	O
Concerto	B-Protocol
Gate	I-Protocol
in	O
2008	O
.	O
</s>
<s>
Joystiq	O
praised	O
Concerto	B-Protocol
Gate	I-Protocol
for	O
attempting	O
to	O
bring	O
the	O
excitement	O
and	O
frustration	O
of	O
the	O
random	O
battle	O
system	O
to	O
an	O
MMORPG	B-Protocol
.	O
</s>
<s>
In	O
2009	O
,	O
Game	O
Campus	O
announced	O
that	O
Concerto	B-Protocol
Gate	I-Protocol
and	O
five	O
other	O
games	O
would	O
be	O
compatible	O
with	O
the	O
ONE	O
Power-Up	O
Game	O
Card	O
for	O
video	O
game	O
related	O
micro	O
transactions	O
.	O
</s>
