<s>
,	O
known	O
in	O
Europe	O
as	O
Princess	B-Application
Debut	I-Application
:	O
The	O
Royal	O
Ball	O
,	O
is	O
a	O
rhythm	O
otome	B-Application
game	I-Application
published	O
by	O
Natsume	O
and	O
developed	O
by	O
Cave	O
for	O
the	O
Nintendo	B-Device
DS	I-Device
.	O
</s>
<s>
Princess	B-Application
Debut	I-Application
opens	O
with	O
the	O
player	O
character	O
speaking	O
to	O
a	O
friend	O
of	O
hers	O
.	O
</s>
<s>
Princess	B-Application
Debut	I-Application
is	O
the	O
first	O
game	O
to	O
be	O
commissioned	O
directly	O
by	O
Natsume	O
Inc	O
.	O
in	O
the	O
United	O
States	O
,	O
as	O
opposed	O
to	O
the	O
development	O
originating	O
in	O
Japan	O
.	O
</s>
<s>
Princess	B-Application
Debut	I-Application
received	O
"	O
average	O
"	O
reviews	O
according	O
to	O
the	O
review	B-Application
aggregation	I-Application
website	O
Metacritic	O
.	O
</s>
