<s>
It	O
is	O
the	O
666th	O
year	O
for	O
the	O
world	O
of	O
magic	O
,	O
and	O
the	O
Crimson	O
Kingdom	O
is	O
facing	O
destruction	O
at	O
the	O
hands	O
of	O
The	O
Black	B-Application
Slayer	I-Application
,	O
Demon	O
King	O
of	O
the	O
Underground	O
Dark	O
Empire	O
.	O
</s>
<s>
With	O
Slayer	B-Application
's	O
forces	O
closing	O
in	O
,	O
Ozzy	O
,	O
Randy	O
and	O
Zakk	O
escape	O
to	O
another	O
dimension	O
,	O
with	O
the	O
hope	O
of	O
eventually	O
bringing	O
light	O
back	O
into	O
the	O
world	O
.	O
</s>
<s>
Meanwhile	O
,	O
Black	B-Application
Slayer	I-Application
has	O
increased	O
his	O
empire	O
over	O
the	O
countryside	O
,	O
making	O
his	O
interdimensional	O
forces	O
even	O
stronger	O
.	O
</s>
<s>
In	O
order	O
to	O
defeat	O
Black	B-Application
Slayer	I-Application
and	O
his	O
army	O
,	O
Randy	O
must	O
retrieve	O
the	O
Five	O
Crimson	O
Emblem	O
Seals	O
.	O
</s>
<s>
Making	O
matters	O
worse	O
,	O
Randy	O
now	O
must	O
wage	O
his	O
war	O
against	O
Black	B-Application
Slayer	I-Application
alone	O
,	O
for	O
Zakk	O
suddenly	O
goes	O
missing	O
and	O
Ozzy	O
passes	O
away	O
.	O
</s>
<s>
It	O
is	O
similar	O
to	O
the	O
game	O
Getsu	B-Application
Fūma	I-Application
Den	I-Application
.	O
</s>
<s>
In	O
fact	O
,	O
one	O
of	O
the	O
stages	O
has	O
sprites	O
and	O
graphics	O
similar	O
to	O
those	O
found	O
in	O
Konami	O
's	O
other	O
game	O
,	O
Contra	B-Application
(	O
the	O
final	O
boss	O
is	O
also	O
very	O
similar	O
to	O
Contra	B-Application
's	O
)	O
.	O
</s>
<s>
The	O
HUD	O
is	O
like	O
the	O
one	O
used	O
in	O
Nintendo	O
's	O
Zelda	B-Application
II	I-Application
:	I-Application
The	I-Application
Adventure	I-Application
of	I-Application
Link	I-Application
.	O
</s>
<s>
These	O
enemies	O
include	O
gargoyles	B-Application
and	O
flying	O
eyeballs	O
.	O
</s>
<s>
In	O
order	O
to	O
find	O
and	O
defeat	O
Black	B-Application
Slayer	I-Application
,	O
the	O
player	O
must	O
travel	O
through	O
six	O
stages	O
,	O
which	O
primarily	O
consist	O
of	O
forests	O
,	O
castles	O
,	O
and	O
caverns	O
,	O
all	O
while	O
seeking	O
the	O
Five	O
Crimson	O
Family	O
Seals	O
.	O
</s>
<s>
Developed	O
by	O
Japanese	O
videogame	O
company	O
Irem	O
,	O
the	O
game	O
is	O
based	O
on	O
the	O
1983	O
album	O
Holy	B-Device
Diver	I-Device
by	O
Dio	O
;	O
however	O
,	O
it	O
's	O
unofficial	O
and	O
has	O
no	O
connection	O
with	O
the	O
band	O
.	O
</s>
<s>
Other	O
characters	O
and	O
locations	O
in	O
the	O
game	O
are	O
references	O
to	O
rock	O
music	O
such	O
as	O
the	O
Crimson	O
Kingdom	O
and	O
Black	B-Application
Slayer	I-Application
.	O
</s>
<s>
In	O
2018	O
,	O
29	O
years	O
after	O
the	O
game	O
was	O
first	O
released	O
,	O
distributor	O
Retro-bit	O
announced	O
that	O
they	O
would	O
give	O
Holy	B-Device
Diver	I-Device
a	O
worldwide	O
physical	O
re-release	O
for	O
the	O
Nintendo	O
Entertainment	O
System	O
.	O
</s>
<s>
The	O
game	O
was	O
also	O
released	O
on	O
Retro-bit	O
'	O
s	O
microconsole	B-Device
the	O
Super	O
Retro-Cade	O
.	O
</s>
<s>
Many	O
reviewers	O
and	O
previews	O
also	O
noted	O
the	O
similarity	O
to	O
Konami	O
's	O
earlier	O
Castlevania	B-Application
NES	O
installments	O
,	O
with	O
one	O
publication	O
calling	O
the	O
game	O
a	O
"	O
Castlevania	B-Application
clone	O
"	O
.	O
</s>
