<s>
is	O
an	O
eroge	B-Application
visual	O
novel	O
by	O
Leaf	O
.	O
</s>
<s>
Kusari	B-Application
was	O
the	O
fifth	O
top	O
selling	O
computer	O
game	O
on	O
getchu.com	O
for	O
the	O
month	O
of	O
its	O
release	O
,	O
and	O
it	O
was	O
the	O
44th	O
top	O
selling	O
eroge	B-Application
for	O
2005	O
.	O
</s>
<s>
Although	O
these	O
are	O
very	O
good	O
sales	O
overall	O
,	O
they	O
pale	O
in	O
comparison	O
to	O
many	O
of	O
Leaf	O
's	O
other	O
titles	O
,	O
most	O
notably	O
against	O
Leaf	O
's	O
To	B-Application
Heart	I-Application
2	I-Application
XRATED	I-Application
which	O
ranked	O
#1	O
in	O
the	O
same	O
year	O
.	O
</s>
<s>
Kusari	B-Application
was	O
one	O
of	O
four	O
games	O
(	O
Aruruu	O
to	O
Asobo	O
!	O
</s>
<s>
!,	O
Tears	B-Application
to	I-Application
Tiara	I-Application
,	O
Kusari	B-Application
and	O
ToHeart2	B-Application
XRATED	I-Application
)	O
Leaf	O
was	O
forced	O
to	O
release	O
its	O
source	O
code	O
to	O
the	O
public	O
due	O
to	O
having	O
used	O
the	O
Xvid	B-Algorithm
video	B-Application
codec	I-Application
in	O
the	O
game	O
without	O
complying	O
to	O
the	O
software	O
's	O
license	O
.	O
</s>
<s>
XVid	B-Algorithm
is	O
licensed	B-License
under	O
the	O
GNU	B-License
Public	I-License
license	I-License
,	O
which	O
requires	O
that	O
programs	O
using	O
the	O
codec	O
to	O
make	O
their	O
source	O
code	O
available	O
to	O
program	O
users	O
.	O
</s>
<s>
A	O
source	O
code	O
mirror	O
is	O
hosted	O
on	O
a	O
GitHub	B-Application
repository	O
.	O
</s>
