<s>
21	B-Application
:	I-Application
Two	I-Application
One	I-Application
is	O
a	O
Japanese	O
murder	O
mystery	O
visual	O
novel	O
developed	O
by	O
BasiL	O
,	O
it	O
was	O
first	O
released	O
as	O
an	O
adult	B-Application
PC	B-Device
game	O
for	O
Microsoft	B-Application
Windows	I-Application
on	O
May	O
25	O
,	O
2001	O
.	O
</s>
<s>
21	B-Application
:	I-Application
Two	I-Application
One	I-Application
was	O
later	O
released	O
for	O
the	B-Operating_System
Dreamcast	I-Operating_System
by	O
PrincessSoft	O
on	O
December	O
27	O
,	O
2001	O
.	O
</s>
<s>
The	O
game	O
is	O
the	O
second	O
installment	O
by	O
BasiL	O
,	O
and	O
after	O
the	O
completion	O
of	O
21	B-Application
:	I-Application
Two	I-Application
One	I-Application
,	O
BasiL	O
went	O
on	O
to	O
create	O
their	O
third	O
and	O
final	O
eroge	B-Application
,	O
Cherry	B-Application
Petals	I-Application
Fall	I-Application
Like	I-Application
Teardrops	I-Application
,	O
before	O
forming	O
a	O
new	O
company	O
called	O
Navel	O
.	O
</s>
<s>
Gameplay	O
in	O
21	B-Application
:	I-Application
Two	I-Application
One	I-Application
offers	O
branching	O
plot	O
lines	O
,	O
and	O
a	O
multi-choice	O
navigation	O
,	O
where	O
the	O
player	O
can	O
attain	O
multiple	O
endings	O
.	O
</s>
<s>
21	B-Application
:	I-Application
Two	I-Application
One	I-Application
had	O
good	O
sales	O
,	O
premiering	O
at	O
No	O
.	O
</s>
<s>
21	B-Application
:	I-Application
Two	I-Application
One	I-Application
is	O
a	O
romance	O
and	O
murder	O
mystery	O
visual	O
novel	O
where	O
the	O
player	O
assumes	O
the	O
role	O
of	O
Takuya	O
Kirishima	O
,	O
the	O
main	O
protagonist	O
of	O
the	O
game	O
.	O
</s>
<s>
For	O
example	O
,	O
in	O
several	O
instances	O
in	O
the	O
game	O
,	O
when	O
the	O
player	O
is	O
conversing	O
with	O
another	O
character	O
,	O
they	O
will	O
be	O
given	O
the	O
following	O
options	O
:	O
"	O
Trust	O
"	O
,	O
"	O
Normal	O
"	O
,	O
and	O
"	O
Suspicion	O
"	O
(	O
comparable	O
with	O
L.A.	B-Application
Noire	I-Application
)	O
.	O
</s>
<s>
21	B-Application
:	I-Application
Two	I-Application
One	I-Application
is	O
BasiL	O
's	O
second	O
project	O
,	O
after	O
their	O
first	O
visual	O
novel	O
Bless	O
:	O
Close	O
Your	O
Eyes	O
,	O
Open	O
Your	O
Mind	O
.	O
</s>
<s>
After	O
21	B-Application
:	I-Application
Two	I-Application
One	I-Application
,	O
BasiL	O
went	O
on	O
to	O
create	O
their	O
final	O
project	O
Cherry	B-Application
Petals	I-Application
Fall	I-Application
Like	I-Application
Teardrops	I-Application
,	O
before	O
forming	O
a	O
new	O
company	O
called	O
Navel	O
,	O
which	O
would	O
go	O
on	O
to	O
creating	O
successful	O
visual	O
novels	O
like	O
Shuffle	B-Application
!	I-Application
</s>
<s>
and	O
Oretachi	B-Application
ni	I-Application
Tsubasa	I-Application
wa	I-Application
Nai	I-Application
.	O
</s>
<s>
BasiL	O
released	O
21	B-Application
:	I-Application
Two	I-Application
One	I-Application
as	O
a	O
first	O
press	O
limited	O
edition	O
on	O
May	O
25	O
,	O
2001	O
,	O
and	O
as	O
a	O
regular	O
edition	O
on	O
June	O
8	O
,	O
2001	O
,	O
for	O
the	O
PC	B-Device
.	O
</s>
<s>
The	O
PC	B-Device
game	O
was	O
distributed	O
as	O
two	O
CDs	B-Device
,	O
and	O
is	O
playable	O
on	O
Windows	B-Device
98	I-Device
,	O
Windows	B-Application
2K	I-Application
,	O
and	O
Windows	B-Device
ME	I-Device
.	O
</s>
<s>
On	O
December	O
27	O
,	O
2001	O
,	O
both	O
regular	O
edition	O
and	O
first	O
press	O
limited	O
edition	O
editions	O
of	O
the	O
game	O
were	O
released	O
for	O
the	B-Operating_System
Dreamcast	I-Operating_System
by	O
PrincessSoft	O
,	O
and	O
another	O
version	O
of	O
the	B-Operating_System
Dreamcast	I-Operating_System
port	O
of	O
the	O
game	O
entitled	O
21	B-Application
:	I-Application
Two	I-Application
One	I-Application
DreKore	O
was	O
released	O
on	O
October	O
31	O
,	O
2002	O
.	O
</s>
<s>
21	B-Application
:	I-Application
Two	I-Application
One	I-Application
DreKore	O
is	O
a	O
Dorikore	O
release	O
,	O
otherwise	O
known	O
as	O
a	O
Dreamcast	B-Operating_System
Collection	O
,	O
which	O
is	O
a	O
budget	O
label	O
given	O
to	O
re-released	O
Sega	B-Operating_System
Dreamcast	I-Operating_System
games	O
in	O
Japan	O
.	O
</s>
<s>
According	O
to	O
a	O
sales	O
ranking	O
of	O
bishōjo	B-Application
games	I-Application
conducted	O
by	O
PCNews	O
,	O
21	B-Application
:	I-Application
Two	I-Application
One	I-Application
premiered	O
at	O
No	O
.	O
</s>
<s>
Then	O
,	O
during	O
the	O
second	O
half	O
of	O
June	O
2001	O
,	O
21	B-Application
:	I-Application
Two	I-Application
One	I-Application
made	O
one	O
last	O
charting	O
appearance	O
at	O
No	O
.	O
</s>
