<s>
is	O
a	O
Japanese	O
adult	B-Application
visual	O
novel	O
developed	O
by	O
Marron	O
that	O
was	O
released	O
for	O
Windows	B-Application
on	O
July	O
27	O
,	O
2001	O
.	O
</s>
<s>
The	O
gameplay	O
in	O
Cosmos	B-Application
no	I-Application
Sora	I-Application
ni	I-Application
follows	O
a	O
branching	O
plot	O
line	O
which	O
offers	O
pre-determined	O
scenarios	O
with	O
courses	O
of	O
interaction	O
,	O
and	O
focuses	O
on	O
the	O
appeal	O
of	O
the	O
female	O
main	O
characters	O
by	O
the	O
player	O
character	O
.	O
</s>
<s>
Light	O
novels	O
,	O
a	O
comic	O
anthology	O
and	O
audio	O
dramas	O
have	O
been	O
produced	O
based	O
on	O
Cosmos	B-Application
no	I-Application
Sora	I-Application
ni	I-Application
.	O
</s>
<s>
Cosmos	B-Application
no	I-Application
Sora	I-Application
ni	I-Application
is	O
a	O
romance	O
visual	O
novel	O
in	O
which	O
the	O
player	O
assumes	O
the	O
role	O
of	O
Yasuomi	O
Nīzawa	O
(	O
the	O
player	O
can	O
choose	O
the	O
protagonist	O
's	O
name	O
)	O
.	O
</s>
<s>
Yasuomi	O
Nīzawa	O
was	O
separated	O
from	O
his	O
parents	O
and	O
moved	O
into	O
his	O
grandfather	O
's	O
house	O
after	O
losing	O
his	O
memories	O
as	O
a	O
child	O
,	O
as	O
the	O
amnesia	B-Application
distanced	O
him	O
from	O
his	O
parents	O
.	O
</s>
<s>
The	O
main	O
story	O
of	O
Cosmos	B-Application
no	I-Application
Sora	I-Application
ni	I-Application
takes	O
place	O
in	O
the	O
fall	O
season	O
when	O
Yasuomi	O
is	O
a	O
sophomore	O
at	O
.	O
</s>
<s>
Yasuomi	O
is	O
the	O
protagonist	O
of	O
Cosmos	B-Application
no	I-Application
Sora	I-Application
ni	I-Application
who	O
lost	O
his	O
memories	O
in	O
childhood	O
.	O
</s>
<s>
Cosmos	B-Application
no	I-Application
Sora	I-Application
ni	I-Application
is	O
the	O
first	O
visual	O
novel	O
developed	O
by	O
Marron	O
.	O
</s>
<s>
Furthermore	O
,	O
Cosmos	B-Application
no	I-Application
Sora	I-Application
ni	I-Application
is	O
self-described	O
as	O
a	O
.	O
</s>
<s>
On	O
July	O
27	O
,	O
2001	O
,	O
Hobibox	O
released	O
Cosmos	B-Application
no	I-Application
Sora	I-Application
ni	I-Application
as	O
one	O
CD-ROM	B-Device
compatible	O
to	O
the	O
Windows	O
95/98/ME	O
operating	O
systems	O
.	O
</s>
<s>
The	O
story	O
is	O
a	O
crossover	O
of	O
Cosmos	B-Application
no	I-Application
Sora	I-Application
ni	I-Application
and	O
Himawari	O
no	O
Chapel	O
de	O
Kimi	O
to	O
.	O
</s>
<s>
All	O
songs	O
in	O
Cosmos	B-Application
no	I-Application
Sora	I-Application
ni	I-Application
are	O
sung	O
by	O
Yuiko	O
.	O
</s>
<s>
In	O
a	O
national	O
sales	O
ranking	O
of	O
bishōjo	B-Application
games	I-Application
conducted	O
by	O
PCNews	O
,	O
Cosmos	B-Application
no	I-Application
Sora	I-Application
ni	I-Application
charted	O
for	O
the	O
first	O
time	O
at	O
number	O
12	O
at	O
the	O
time	O
of	O
its	O
release	O
.	O
</s>
<s>
Cosmos	B-Application
no	I-Application
Sora	I-Application
ni	I-Application
placed	O
fourth	O
in	O
the	O
category	O
"	O
best	O
adult	B-Application
game	O
of	O
the	O
year	O
2002	O
"	O
on	O
E-Login	O
.	O
</s>
<s>
Cosmos	B-Application
no	I-Application
Sora	I-Application
ni	I-Application
is	O
considered	O
to	O
be	O
a	O
pioneer	O
of	O
the	O
which	O
started	O
to	O
gain	O
popularity	O
in	O
2003	O
.	O
</s>
<s>
Cosmos	B-Application
no	I-Application
Sora	I-Application
ni	I-Application
is	O
also	O
often	O
speculated	O
to	O
be	O
where	O
the	O
term	O
"	O
tsundere	O
"	O
originated	O
from	O
,	O
as	O
Haruhi	O
Sakuma	O
is	O
one	O
of	O
the	O
earliest	O
examples	O
of	O
characters	O
with	O
tsundere	O
traits	O
.	O
</s>
