<s>
is	O
a	O
shoot	O
'	O
em	O
up	O
game	O
released	O
by	O
G.rev	O
in	O
2012	O
for	O
the	O
Nintendo	B-Operating_System
3DS	I-Operating_System
.	O
</s>
<s>
It	O
was	O
directed	O
by	O
Hiroshi	O
Iuchi	O
,	O
famous	O
for	O
his	O
seminal	O
shmups	O
Radiant	B-Application
Silvergun	I-Application
and	O
Ikaruga	B-Application
.	O
</s>
<s>
Kokuga	B-Application
received	O
positive	O
reviews	O
from	O
critics	O
upon	O
release	O
.	O
</s>
