<s>
is	O
a	O
Japanese	O
adult	B-Application
visual	O
novel	O
developed	O
by	O
Akatsuki	O
Works	O
and	O
first	O
released	O
for	O
Windows	B-Application
as	O
a	O
DVD	O
on	O
June	O
26	O
,	O
2008	O
as	O
a	O
limited	O
edition	O
;	O
the	O
regular	O
edition	O
followed	O
on	O
July	O
31	O
,	O
2008	O
.	O
</s>
<s>
The	O
gameplay	O
in	O
Rui	B-Application
wa	I-Application
Tomo	I-Application
o	I-Application
Yobu	I-Application
follows	O
a	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
five	O
female	O
main	O
characters	O
.	O
</s>
<s>
The	O
title	O
Rui	B-Application
wa	I-Application
Tomo	I-Application
o	I-Application
Yobu	I-Application
is	O
also	O
a	O
Japanese	O
proverb	O
equivalent	O
to	O
the	O
English	O
proverb	O
"	O
birds	O
of	O
a	O
feather	O
flock	O
together	O
"	O
when	O
written	O
with	O
the	O
kanji	O
and	O
kana	O
.	O
</s>
<s>
Art	O
direction	O
and	O
character	O
design	O
were	O
done	O
by	O
Hokuto	O
Saeki	O
who	O
was	O
also	O
one	O
of	O
five	O
main	O
artists	O
for	O
BaseSon	O
's	O
2007	O
visual	O
novel	O
Koihime	B-Application
Musō	I-Application
.	O
</s>
<s>
Before	O
Rui	B-Application
wa	I-Application
Tomo	I-Application
o	I-Application
Yobu	I-Application
's	O
initial	O
release	O
,	O
a	O
free	O
game	O
demo	O
became	O
available	O
for	O
download	O
at	O
the	O
visual	O
novel	O
's	O
official	O
website	O
.	O
</s>
<s>
The	O
full	O
game	O
was	O
first	O
released	O
on	O
June	O
26	O
,	O
2008	O
as	O
a	O
limited	O
edition	O
playable	O
as	O
a	O
DVD	O
on	O
a	O
Microsoft	B-Application
Windows	I-Application
PC	B-Device
;	O
the	O
regular	O
edition	O
followed	O
on	O
July	O
31	O
,	O
2008	O
.	O
</s>
<s>
The	O
limited	O
edition	O
version	O
of	O
Rui	O
wa	O
Tomo	O
o	O
Yobu''	O
ranked	O
tenth	O
in	O
terms	O
of	O
national	O
sales	O
of	O
PC	B-Device
games	O
in	O
Japan	O
in	O
June	O
2008	O
.	O
</s>
