<s>
is	O
a	O
Japanese	O
erotic	B-Application
video	I-Application
game	I-Application
developed	O
by	O
Pajamas	O
Soft	O
and	O
was	O
first	O
released	O
on	O
October	O
6	O
,	O
2000	O
,	O
and	O
a	O
DVD	O
edition	O
for	O
Windows	O
was	O
released	O
on	O
January	O
25	O
,	O
2008	O
.	O
</s>
<s>
The	O
game	O
was	O
ported	O
to	O
the	B-Operating_System
Dreamcast	I-Operating_System
on	O
November	O
29	O
,	O
2001	O
,	O
with	O
the	O
adult	O
content	O
removed	O
by	O
KID	O
.	O
</s>
<s>
The	O
sequel	O
,	O
Prism	B-Application
Ark	I-Application
,	O
came	O
out	O
on	O
August	O
25	O
,	O
2006	O
.	O
</s>
<s>
Some	O
characters	O
also	O
made	O
an	O
appearance	O
on	O
the	O
Prism	B-Application
Ark	I-Application
anime	O
.	O
</s>
