<s>
Cross	B-Application
Days	I-Application
is	O
a	O
Japanese	O
erotic	O
visual	O
novel	O
developed	O
by	O
0verflow	O
,	O
released	O
on	O
March	O
19	O
,	O
2010	O
for	O
Windows	O
and	O
later	O
ported	O
as	O
a	O
DVD	B-Application
game	I-Application
and	O
for	O
the	O
PlayStation	B-Operating_System
Portable	I-Operating_System
(	O
PSP	B-Operating_System
)	O
.	O
</s>
<s>
Though	O
the	O
game	O
requires	O
little	O
interaction	O
from	O
users	O
,	O
Cross	B-Application
Days	I-Application
engages	O
the	O
player	O
through	O
a	O
nonlinear	O
plot	O
that	O
they	O
are	O
given	O
opportunities	O
to	O
change	O
the	O
course	O
of	O
during	O
play	O
.	O
</s>
<s>
The	O
game	O
is	O
the	O
third	O
installation	O
of	O
the	O
School	B-Application
Days	I-Application
line	O
of	O
series	O
,	O
succeeding	O
Summer	B-Application
Days	I-Application
.	O
</s>
<s>
0verflow	O
announced	O
work	O
on	O
Cross	B-Application
Days	I-Application
in	O
December	O
2008	O
.	O
</s>
<s>
Following	O
the	O
game	O
's	O
release	O
,	O
Cross	B-Application
Days	I-Application
made	O
transitions	O
into	O
other	O
media	O
:	O
a	O
manga	O
was	O
serialized	O
in	O
the	O
Kadokawa	O
Shoten	O
magazine	O
Monthly	O
Comp	O
Ace	O
from	O
April	O
26	O
to	O
August	O
10	O
,	O
2010	O
;	O
three	O
light	O
novels	O
were	O
published	O
from	O
September	O
15	O
to	O
October	O
29	O
,	O
as	O
was	O
a	O
strategy	O
guide	O
;	O
a	O
radio	O
drama	O
was	O
broadcast	O
during	O
development	O
;	O
and	O
the	O
game	O
's	O
original	O
soundtrack	O
was	O
also	O
published	O
by	O
Lantis	O
from	O
April	O
24	O
to	O
July	O
21	O
.	O
</s>
<s>
Cross	B-Application
Days	I-Application
is	O
a	O
visual	O
novel	O
.	O
</s>
<s>
Like	O
the	O
games	O
before	O
it	O
,	O
Cross	B-Application
Days	I-Application
is	O
presented	O
with	O
limited	O
animation	O
.	O
</s>
<s>
Unlike	O
in	O
Summer	B-Application
Days	I-Application
,	O
the	O
story	O
in	O
Cross	B-Application
Days	I-Application
is	O
not	O
rewritten	O
as	O
a	O
spin-off	O
of	O
the	O
original	O
story	O
,	O
but	O
occurs	O
during	O
the	O
events	O
of	O
it	O
,	O
making	O
the	O
game	O
a	O
parallel	O
series	O
to	O
School	B-Application
Days	I-Application
.	O
</s>
<s>
Cross	B-Application
Days	I-Application
follows	O
Yuuki	O
Ashikaga	O
,	O
a	O
bespectacled	O
young	O
lad	O
whose	O
withdrawn	O
school	O
life	O
goes	O
awry	O
when	O
his	O
affection	O
for	O
two	O
girls	O
begins	O
to	O
affect	O
his	O
relationships	O
with	O
his	O
friends	O
and	O
peers	O
.	O
</s>
<s>
Chie	O
Ashikaga	O
,	O
the	O
mildly	O
abusive	O
older	O
sister	O
of	O
Yuuki	O
,	O
and	O
Kyouichi	O
Kasannoin	O
,	O
Nanami	O
Kanroji	O
's	O
boyfriend	O
,	O
having	O
only	O
previously	O
made	O
cameo	O
appearances	O
in	O
the	O
School	B-Application
Days	I-Application
anime	O
,	O
return	O
to	O
make	O
more	O
prominent	O
roles	O
,	O
as	O
does	O
Ai	O
Yamagata	O
,	O
a	O
character	O
last	O
seen	O
from	O
Summer	B-Application
Days	I-Application
.	O
</s>
<s>
News	O
of	O
Cross	B-Application
Days	I-Application
first	O
surfaced	O
in	O
the	O
December	O
2008	O
issue	O
of	O
Tech	O
Gian	O
,	O
a	O
magazine	O
published	O
by	O
Enterbrain	O
,	O
on	O
October	O
21	O
,	O
showing	O
first	O
ever	O
screenshots	O
,	O
reporting	O
on	O
the	O
story	O
and	O
characters	O
,	O
and	O
mentioning	O
that	O
Cross	B-Application
Days	I-Application
would	O
contain	O
3D	O
animation	O
with	O
a	O
meticulously	O
reworked	O
plot	O
and	O
male	O
protagonist	O
.	O
</s>
<s>
Company	O
staff	O
attended	O
Dream	O
Party	O
,	O
an	O
anime	O
convention	O
,	O
in	O
Osaka	O
on	O
November	O
16	O
,	O
2008	O
,	O
selling	O
Cross	B-Application
Days	I-Application
telephone	O
cards	O
while	O
stores	O
took	O
pre-orders	O
for	O
the	O
game	O
,	O
reportedly	O
filling	O
reservations	O
in	O
days	O
.	O
</s>
<s>
On	O
December	O
5	O
,	O
0verflow	O
announced	O
that	O
a	O
set	O
of	O
USB	B-Protocol
teledildonics	O
,	O
collectively	O
known	O
as	O
SOM	O
,	O
would	O
be	O
compatible	O
with	O
Cross	B-Application
Days	I-Application
,	O
manufactured	O
by	O
Goods	O
Land	O
.	O
</s>
<s>
On	O
January	O
8	O
,	O
2009	O
,	O
0verflow	O
announced	O
that	O
starting	O
that	O
day	O
,	O
Lantis	O
would	O
be	O
airing	O
a	O
weekly	O
,	O
episodic	O
internet	O
radio	O
drama	O
of	O
the	O
game	O
's	O
characters	O
,	O
titled	O
Radio	O
Cross	B-Application
Days	I-Application
.	O
</s>
<s>
Cross	B-Application
Days	I-Application
was	O
originally	O
scheduled	O
to	O
come	O
out	O
on	O
February	O
27	O
,	O
2009	O
,	O
but	O
its	O
release	O
was	O
postponed	O
six	O
times	O
:	O
to	O
April	O
24	O
,	O
June	O
26	O
,	O
November	O
20	O
,	O
December	O
18	O
,	O
January	O
29	O
,	O
2010	O
,	O
and	O
to	O
March	O
19	O
,	O
2010	O
,	O
when	O
it	O
finally	O
came	O
out	O
.	O
</s>
<s>
Cross	B-Application
Days	I-Application
was	O
ported	O
to	O
two	O
other	O
platforms	O
.	O
</s>
<s>
AiCherry	O
,	O
an	O
interactive	B-Application
movie	I-Application
developer	O
,	O
re-released	O
Cross	B-Application
Days	I-Application
as	O
a	O
DVD	B-Application
game	I-Application
on	O
April	O
28	O
,	O
2011	O
,	O
as	O
did	O
PalaceGame	O
,	O
a	O
UMD	O
publisher	O
,	O
for	O
the	O
PlayStation	B-Operating_System
Portable	I-Operating_System
(	O
PSP	B-Operating_System
)	O
on	O
July	O
29	O
,	O
2011	O
.	O
</s>
<s>
On	O
April	O
15	O
,	O
2010	O
,	O
roughly	O
a	O
month	O
after	O
Cross	B-Application
Days	I-Application
was	O
released	O
,	O
BBC	O
News	O
reported	O
on	O
the	O
spread	O
of	O
a	O
virus	O
named	O
Kenzero	B-Application
masquerading	O
on	O
peer-to-peer	O
(	O
P2P	O
)	O
networks	O
as	O
unlicensed	O
copies	O
of	O
erotic	O
games	O
;	O
one	O
of	O
which	O
,	O
according	O
to	O
software	O
developer	O
SPAMFighter	O
,	O
included	O
Cross	B-Application
Days	I-Application
.	O
</s>
<s>
Cross	B-Application
Days	I-Application
for	O
Windows	O
premiered	O
as	O
the	O
third	O
most	O
sold	O
game	O
on	O
Getchu.com,	O
a	O
major	O
redistributor	O
of	O
visual	O
novel	O
and	O
domestic	O
anime	O
products	O
,	O
during	O
the	O
month	O
of	O
its	O
release	O
,	O
ranking	O
twelfth	O
for	O
the	O
first	O
half	O
of	O
2010	O
,	O
and	O
thirty-first	O
for	O
the	O
whole	O
year	O
.	O
</s>
<s>
The	O
DVD	B-Application
game	I-Application
ranked	O
as	O
the	O
most	O
sold	O
DVDi	B-Application
for	O
the	O
first	O
half	O
of	O
2011	O
,	O
and	O
forty-seventh	O
most	O
from	O
November	O
26	O
to	O
December	O
27	O
.	O
</s>
<s>
Cross	B-Application
Days	I-Application
for	O
the	O
PSP	B-Operating_System
additionally	O
ranked	O
as	O
the	O
fifteenth	O
most	O
sold	O
UMD	O
game	O
during	O
that	O
time	O
as	O
well	O
.	O
</s>
<s>
Based	O
on	O
the	O
story	O
of	O
the	O
game	O
,	O
Cross	B-Application
Days	I-Application
was	O
published	O
into	O
a	O
manga	O
,	O
written	O
by	O
Yoko	O
Kagura	O
and	O
illustrated	O
by	O
Homare	O
Sakazuki	O
.	O
</s>
<s>
In	O
addition	O
to	O
the	O
manga	O
,	O
Cross	B-Application
Days	I-Application
was	O
made	O
into	O
other	O
print	O
.	O
</s>
<s>
Cross	B-Application
Days	I-Application
,	O
a	O
novel	O
,	O
was	O
published	O
by	O
Harvest	O
Books	O
on	O
September	O
15	O
,	O
written	O
by	O
Mutsuki	O
Mizusaki	O
.	O
</s>
<s>
As	O
was	O
the	O
case	O
for	O
School	B-Application
Days	I-Application
and	O
Summer	B-Application
Days	I-Application
,	O
the	O
original	O
soundtrack	O
of	O
Cross	B-Application
Days	I-Application
was	O
reproduced	O
for	O
distribution	O
alongside	O
the	O
game	O
,	O
initially	O
scheduled	O
for	O
February	O
27	O
,	O
2009	O
.	O
</s>
<s>
Radio	O
Cross	B-Application
Days	I-Application
,	O
a	O
radio	O
drama	O
broadcast	O
from	O
January	O
8	O
,	O
2009	O
,	O
to	O
March	O
25	O
,	O
2010	O
,	O
was	O
the	O
second	O
and	O
final	O
set	O
of	O
audio	O
compilations	O
made	O
for	O
the	O
game	O
by	O
Lantis	O
.	O
</s>
<s>
Considerable	O
effort	O
was	O
made	O
to	O
market	O
and	O
promote	O
Cross	B-Application
Days	I-Application
before	O
and	O
after	O
its	O
release	O
,	O
including	O
the	O
sale	O
of	O
brand	O
merchandise	O
.	O
</s>
