<s>
An	O
eroge	B-Application
(	O
or	O
,	O
erogē	O
;	O
;	O
a	O
portmanteau	O
of	O
erotic	O
game	O
,	O
erochikku	O
gēmu	O
)	O
is	O
a	O
Japanese	O
genre	O
of	O
erotic	O
video	O
game	O
.	O
</s>
<s>
In	O
1982	B-Application
,	O
Japan	O
's	O
Koei	O
,	O
founded	O
by	O
husband-and-wife	O
team	O
Yoichi	O
and	O
Keiko	O
Erikawa	O
(	O
and	O
later	O
known	O
for	O
strategy	B-Application
video	I-Application
games	I-Application
)	O
,	O
released	O
the	O
first	O
erotic	O
computer	O
game	O
with	O
sexually	O
explicit	O
graphics	O
,	O
Night	B-Application
Life	I-Application
,	O
an	O
early	O
graphic	O
adventure	O
game	O
for	O
the	O
NEC	B-Device
PC-8801	I-Device
.	O
</s>
<s>
That	O
same	O
year	O
,	O
Koei	O
released	O
another	O
erotic	O
title	O
,	O
Danchi	O
Tsuma	O
no	O
Yuwaku	O
(	O
Seduction	O
of	O
the	O
Condominium	O
Wife	O
)	O
,	O
which	O
was	O
an	O
early	O
role-playing	O
adventure	O
game	O
with	O
colour	O
graphics	O
,	O
owing	O
to	O
the	O
eight-color	O
palette	O
of	O
the	O
NEC	B-Device
PC-8001	I-Device
computer	O
.	O
</s>
<s>
On	O
the	O
other	O
hand	O
,	O
some	O
writers	O
,	O
like	O
Naoki	O
Miyamoto	O
,	O
considered	O
the	O
Yakyūken	O
(	O
1981	B-Application
)	O
produced	O
for	O
Sharp	B-Operating_System
MZ	I-Operating_System
computers	O
by	O
Hudson	O
Soft	O
to	O
be	O
the	O
first	O
Japanese	O
adult	O
game	O
.	O
</s>
<s>
Like	O
with	O
Koei	O
,	O
several	O
other	O
now-famous	O
Japanese	O
companies	O
such	O
as	O
Enix	O
,	O
Square	O
and	O
Nihon	O
Falcom	O
also	O
released	O
erotic	O
adult	B-Application
games	I-Application
for	O
the	O
PC-8801	B-Device
computer	O
in	O
the	O
early	O
1980s	O
before	O
they	O
became	O
mainstream	O
.	O
</s>
<s>
Early	O
eroge	B-Application
usually	O
had	O
simplistic	O
stories	O
and	O
extreme	O
sexual	O
content	O
,	O
such	O
as	O
rape	O
and	O
lolicon	O
.	O
</s>
<s>
In	O
response	O
to	O
increasing	O
pressure	O
from	O
Japanese	O
lobby	O
groups	O
,	O
in	O
mid-1996	O
Sega	O
of	O
Japan	O
announced	O
that	O
they	O
would	O
no	O
longer	O
permit	O
Sega	B-Device
Saturn	I-Device
games	O
to	O
include	O
nudity	O
.	O
</s>
<s>
Eroge	B-Application
,	O
also	O
known	O
as	O
erotic	O
games	O
,	O
have	O
their	O
origins	O
in	O
the	O
early	O
1980s	O
,	O
when	O
Japanese	O
companies	O
introduced	O
their	O
own	O
brands	O
of	O
microcomputer	B-Architecture
to	O
compete	O
with	O
those	O
of	O
the	O
United	O
States	O
.	O
</s>
<s>
Competing	O
systems	O
included	O
the	O
X1	B-Device
,	O
FM-7	B-Device
,	O
MSX	B-Operating_System
,	O
and	O
PC-8801	B-Device
.	O
</s>
<s>
The	O
earliest	O
known	O
commercial	O
erotic	O
computer	O
game	O
is	O
PSK	O
's	O
Lolita	O
Yakyūken	O
,	O
released	O
in	O
1982	B-Application
.	O
</s>
<s>
That	O
same	O
year	O
,	O
Koei	O
released	O
the	O
erotic	O
title	O
,	O
,	O
which	O
was	O
an	O
early	O
role-playing	O
adventure	O
game	O
with	O
color	O
graphics	O
,	O
owing	O
to	O
the	O
eight-color	O
palette	O
of	O
the	O
PC-8001	B-Device
computer	O
.	O
</s>
<s>
In	O
another	O
opinion	O
,	O
Yuji	O
Horii	O
recalled	O
in	O
1986	O
that	O
he	O
saw	O
a	O
demonstration	O
of	O
a	O
Yakyūken-like	O
game	O
running	O
on	O
the	O
FM-8	B-Device
in	O
the	O
end	O
of	O
1981	B-Application
,	O
and	O
he	O
considered	O
Yakyūken	O
was	O
the	O
origin	O
of	O
adult	B-Application
games	I-Application
.	O
</s>
<s>
Some	O
writers	O
say	O
that	O
Yakyūken	O
produced	O
for	O
Sharp	B-Operating_System
MZ	I-Operating_System
computers	O
by	O
Hudson	O
Soft	O
is	O
the	O
first	O
Japanese	O
adult	O
game	O
.	O
</s>
<s>
Other	O
now-famous	O
Japanese	O
companies	O
such	O
as	O
Enix	O
,	O
Square	O
and	O
Nihon	O
Falcom	O
also	O
released	O
erotic	O
adult	B-Application
games	I-Application
for	O
the	O
PC-8801	B-Device
computer	O
in	O
the	O
early	O
1980s	O
before	O
they	O
became	O
mainstream	O
.	O
</s>
<s>
Early	O
eroge	B-Application
usually	O
had	O
simple	O
stories	O
,	O
some	O
even	O
involving	O
anal	O
sex	O
,	O
which	O
often	O
led	O
to	O
widespread	O
condemnation	O
from	O
the	O
Japanese	O
media	O
.	O
</s>
<s>
Erotic	O
games	O
made	O
the	O
PC-8801	B-Device
popular	O
,	O
but	O
customers	O
quickly	O
became	O
tired	O
of	O
paying	O
8800	O
yen	O
( $85	O
)	O
for	O
such	O
simple	O
games	O
.	O
</s>
<s>
Soon	O
,	O
new	O
genres	O
were	O
invented	O
:	O
ASCII	O
's	O
Chaos	O
Angels	O
,	O
a	O
role-playing-based	O
eroge	B-Application
,	O
inspired	O
Dragon	B-Application
Knight	I-Application
by	O
Elf	O
and	O
Rance	B-Application
by	O
AliceSoft	O
.	O
</s>
<s>
In	O
the	O
early	O
1990s	O
eroge	B-Application
games	O
became	O
much	O
more	O
common	O
.	O
</s>
<s>
Most	O
eroge	B-Application
games	O
,	O
a	O
fairly	O
large	O
library	O
,	O
found	O
its	O
way	O
on	O
the	O
PC-9801	B-Operating_System
platform	O
.	O
</s>
<s>
FM	B-Device
Towns	I-Device
also	O
received	O
many	O
games	O
,	O
more	O
so	O
than	O
the	O
X68000	B-Device
or	O
MS-DOS	B-Application
,	O
whilst	O
the	O
MSX	B-Operating_System
platform	O
(	O
which	O
had	O
many	O
eroge	B-Application
games	O
in	O
the	O
1980s	O
)	O
was	O
nearing	O
the	O
end	O
of	O
its	O
lifetime	O
.	O
</s>
<s>
Eroge	B-Application
was	O
much	O
less	O
common	O
on	O
consoles	O
–	O
only	O
NEC	O
's	O
PC	B-General_Concept
Engine	I-General_Concept
series	O
had	O
officially	O
licensed	O
adult	B-Application
games	I-Application
,	O
and	O
from	O
the	O
mid-90s	O
,	O
Sega	O
's	O
Saturn	B-Device
.	O
</s>
<s>
In	O
1992	O
,	O
Elf	O
released	O
Dōkyūsei	B-Application
.	O
</s>
<s>
Soon	O
afterwards	O
,	O
the	O
video	O
game	O
Otogirisou	O
on	O
the	O
Super	B-Application
Famicom	I-Application
attracted	O
the	O
attention	O
of	O
many	O
Japanese	O
gamers	O
.	O
</s>
<s>
In	O
1996	O
,	O
the	O
new	O
software	O
developer	O
and	O
publisher	O
Leaf	O
expanded	O
on	O
this	O
idea	O
,	O
calling	O
it	O
a	O
visual	O
novel	O
and	O
releasing	O
their	O
first	O
successful	O
game	O
,	O
Shizuku	B-Application
,	O
a	O
horror	O
story	O
starring	O
a	O
rapist	O
high	O
school	O
student	O
,	O
with	O
very	O
highly	O
reviewed	O
writing	O
and	O
music	O
.	O
</s>
<s>
Their	O
next	O
game	O
,	O
Kizuato	B-Application
,	O
was	O
almost	O
as	O
dark	O
.	O
</s>
<s>
However	O
,	O
in	O
1997	O
,	O
they	O
released	O
To	B-Application
Heart	I-Application
,	O
a	O
sweetly	O
sentimental	O
story	O
of	O
high	O
school	O
love	O
that	O
became	O
one	O
of	O
the	O
most	O
famous	O
and	O
trendsetting	O
eroge	B-Application
ever	O
.	O
</s>
<s>
To	B-Application
Heart	I-Application
music	O
was	O
so	O
popular	O
it	O
was	O
added	O
to	O
karaoke	O
machines	O
throughout	O
Japan	O
—	O
a	O
first	O
for	O
eroge	B-Application
.	O
</s>
<s>
After	O
a	O
similar	O
game	O
by	O
Tactics	O
,	O
One	B-Application
:	I-Application
Kagayaku	I-Application
Kisetsu	I-Application
e	I-Application
,	O
became	O
a	O
hit	O
in	O
1998	O
,	O
Visual	O
Arts	O
scouted	O
main	O
creative	O
staff	O
of	O
One	O
to	O
form	O
a	O
new	O
brand	O
under	O
them	O
,	O
which	O
became	O
Key	O
.	O
</s>
<s>
According	O
to	O
Satoshi	O
Todome	O
's	O
A	O
History	O
of	O
Eroge	B-Application
,	O
Kanon	O
is	O
still	O
the	O
standard	O
for	O
modern	O
eroge	B-Application
and	O
is	O
referred	O
to	O
as	O
a	O
"	O
baptism	O
"	O
for	O
young	O
otaku	O
in	O
Japan	O
.	O
</s>
<s>
Although	O
many	O
eroge	B-Application
still	O
market	O
themselves	O
primarily	O
on	O
sex	O
,	O
eroge	B-Application
that	O
focus	O
on	O
story	O
are	O
now	O
a	O
major	O
established	O
part	O
of	O
Japanese	O
otaku	O
culture	O
.	O
</s>
<s>
Oftentimes	O
,	O
voice	O
actors	O
who	O
have	O
voiced	O
for	O
eroge	B-Application
have	O
been	O
credited	O
under	O
a	O
pseudonym	O
.	O
</s>
<s>
As	O
the	O
visual	O
novel	O
standard	O
was	O
adopted	O
,	O
the	O
erotic	O
parts	O
in	O
eroge	B-Application
began	O
to	O
become	O
less	O
and	O
less	O
apparent	O
.	O
</s>
<s>
Many	O
eroge	B-Application
become	O
more	O
story-oriented	O
than	O
sex-oriented	O
,	O
making	O
story	O
the	O
main	O
focus	O
for	O
many	O
modern	O
eroge	B-Application
.	O
</s>
<s>
More	O
and	O
more	O
people	O
who	O
used	O
to	O
reject	O
such	O
type	O
of	O
games	O
began	O
to	O
become	O
more	O
open-minded	O
,	O
realizing	O
that	O
eroge	B-Application
are	O
not	O
just	O
about	O
sex	O
anymore	O
.	O
</s>
<s>
A	O
lot	O
of	O
story-focused	O
eroge	B-Application
tend	O
to	O
have	O
only	O
a	O
few	O
erotic	O
scenes	O
.	O
</s>
<s>
There	O
is	O
no	O
set	O
definition	O
for	O
the	O
gameplay	O
of	O
eroge	B-Application
,	O
except	O
that	O
they	O
all	O
include	O
explicit	O
erotic	O
or	O
sexual	O
content	O
depending	O
on	O
the	O
game	O
.	O
</s>
<s>
Like	O
other	O
pornographic	O
media	O
in	O
Japan	O
,	O
erotic	O
scenes	O
feature	O
censorship	O
of	O
genitalia	O
,	O
only	O
becoming	O
uncensored	O
if	O
the	O
game	O
is	O
licensed	O
and	O
released	O
outside	O
Japan	O
,	O
unless	O
produced	O
illegally	O
by	O
dōjin	O
(	O
usually	O
with	O
a	O
construction	O
kit	O
like	O
NScripter	B-Application
or	O
RPG	B-Application
Maker	I-Application
)	O
.	O
</s>
<s>
Eroge	B-Application
is	O
most	O
often	O
a	O
visual	O
novel	O
or	O
dating	O
sim	O
.	O
</s>
<s>
However	O
,	O
there	O
are	O
also	O
many	O
other	O
gameplay	O
genres	O
represented	O
within	O
eroge	B-Application
,	O
such	O
as	O
role-playing	O
games	O
,	O
mahjong	B-Application
games	I-Application
,	O
or	O
puzzle	O
games	O
.	O
</s>
<s>
Some	O
eroge	B-Application
,	O
such	O
as	O
those	O
made	O
by	O
Illusion	O
Soft	O
,	O
are	O
just	O
simulations	O
of	O
sex	O
,	O
with	O
no	O
"	O
conventional	O
"	O
gameplay	O
included	O
.	O
</s>
