<s>
,	O
also	O
known	O
as	O
Yamibō/Yamibou	O
for	O
short	O
,	O
is	O
a	O
Japanese	O
adult	B-Application
visual	O
novel	O
published	O
in	O
December	O
2002	O
by	O
Root	O
.	O
</s>
<s>
There	O
is	O
a	O
one-book	O
manga	O
adaptation	O
,	O
Yami	B-Application
to	I-Application
Bōshi	I-Application
to	I-Application
Hon	I-Application
no	I-Application
Tabibito	I-Application
~	O
Romance	O
,	O
illustrated	O
by	O
Aya	O
Sakurai	O
.	O
</s>
<s>
He	O
also	O
called	O
the	O
series	O
odd	O
because	O
it	O
does	O
not	O
"	O
resemble	O
anything	O
else	O
out	O
there	O
"	O
as	O
it	O
has	O
its	O
origins	O
in	O
an	O
adult	B-Application
visual	O
novel	O
and	O
noted	O
that	O
the	O
storytelling	O
approach	O
is	O
not	O
linear	O
,	O
with	O
the	O
mechanics	O
for	O
the	O
world-shifting	O
in	O
the	O
series	O
being	O
"	O
an	O
interdimensional	O
library	O
"	O
.	O
</s>
