<s>
is	O
a	O
role-playing	O
video	O
game	O
for	O
the	O
PlayStation	B-Device
Vita	I-Device
system	O
.	O
</s>
<s>
It	O
is	O
based	O
on	O
the	O
universe	O
of	O
the	O
MMORPG	B-Protocol
Ragnarok	B-Protocol
Online	I-Protocol
,	O
containing	O
many	O
elements	O
of	O
Norse	O
mythology	O
.	O
</s>
<s>
An	O
updated	O
version	O
titled	O
Ragnarok	B-Application
Odyssey	I-Application
Ace	O
has	O
been	O
released	O
on	O
PlayStation	B-Device
Vita	I-Device
and	O
PlayStation	B-Operating_System
3	I-Operating_System
.	O
</s>
<s>
Ragnarok	B-Application
Odyssey	I-Application
is	O
a	O
real-time	O
action	O
RPG	O
in	O
similar	O
vein	O
to	O
the	O
series	O
Monster	B-Application
Hunter	I-Application
.	O
</s>
<s>
Ragnarok	B-Application
Odyssey	I-Application
Ace	O
is	O
an	O
updated	O
version	O
of	O
Ragnarok	B-Application
Odyssey	I-Application
developed	O
for	O
the	O
PlayStation	B-Device
Vita	I-Device
and	O
PlayStation	B-Operating_System
3	I-Operating_System
.	O
</s>
<s>
It	O
is	O
also	O
possible	O
to	O
import	O
save	O
data	O
from	O
the	O
original	O
game	O
for	O
use	O
in	O
Ragnarok	B-Application
Odyssey	I-Application
Ace	O
.	O
</s>
<s>
The	O
PlayStation	B-Device
Vita	I-Device
version	O
was	O
released	O
on	O
August	O
29	O
,	O
2013	O
in	O
Japan	O
.	O
</s>
<s>
Composer	O
Nobuo	O
Uematsu	O
contributed	O
one	O
new	O
song	O
for	O
Ragnarok	B-Application
Odyssey	I-Application
Ace	O
.	O
</s>
<s>
,	O
Ragnarok	B-Application
Odyssey	I-Application
has	O
sold	O
over	O
100,000	O
copies	O
in	O
Japan	O
.	O
</s>
<s>
Ragnarok	B-Application
Odyssey	I-Application
Ace	O
sold	O
31,622	O
physical	O
retail	O
copies	O
within	O
the	O
first	O
week	O
of	O
release	O
in	O
Japan	O
.	O
</s>
