<s>
Night	B-Application
Slave	I-Application
( ナイト・スレイブ	O
)	O
is	O
an	O
eroge	B-Application
run	O
and	O
gun	O
video	O
game	O
released	O
in	O
1996	O
for	O
the	O
NEC	B-Device
PC-98	I-Device
computer	O
.	O
</s>
<s>
The	O
game	O
's	O
design	O
and	O
gameplay	O
draws	O
inspiration	O
from	O
the	O
Assault	B-Application
Suits	I-Application
series	I-Application
,	O
particularly	O
Assault	B-Application
Suits	I-Application
Valken	I-Application
(	O
1992	O
)	O
,	O
as	O
well	O
as	O
the	O
Gradius	B-Application
series	O
.	O
</s>
<s>
It	O
employs	O
many	O
action	B-Application
role-playing	I-Application
game	I-Application
elements	O
such	O
as	O
permanently	O
levelling	O
up	O
the	O
mecha	O
and	O
various	O
weapons	O
using	O
power-orbs	O
obtained	O
from	O
defeating	O
enemies	O
as	O
well	O
as	O
storyline	O
cut	O
scenes	O
,	O
which	O
occasionally	O
contain	O
lesbian	O
adult	O
content	O
.	O
</s>
