<s>
It	O
primarily	O
consists	O
of	O
a	O
smartphone	B-Application
game	O
that	O
was	O
released	O
on	O
Android	B-Application
and	O
iOS	B-Application
devices	O
on	O
August	O
24	O
,	O
2017	O
,	O
and	O
an	O
anime	O
television	O
series	O
that	O
aired	O
from	O
October	O
to	O
December	O
2017	O
.	O
</s>
<s>
A	O
4-panel	O
manga	O
adaptation	O
is	O
serialized	O
online	O
via	O
the	O
official	O
Dia	B-Application
Horizon	I-Application
website	O
.	O
</s>
<s>
A	O
novel	O
written	O
by	O
Ghost	O
Mikawa	O
,	O
titled	O
Dia	B-Application
Horizon	I-Application
:	O
Akatsuki	O
no	O
Keiyakusha	O
,	O
is	O
being	O
serialized	O
online	O
via	O
Kadokawa	O
's	O
Kakuyomu	O
website	O
.	O
</s>
<s>
Dia	B-Application
Horizon	I-Application
was	O
announced	O
by	O
Square	O
Enix	O
as	O
a	O
"	O
mixed	O
media	O
project	O
"	O
with	O
a	O
trailer	O
in	O
July	O
2017	O
.	O
</s>
<s>
The	O
smartphone	B-Application
game	O
was	O
released	O
on	O
Android	B-Application
and	O
iOS	B-Application
devices	O
in	O
Japan	O
on	O
August	O
24	O
,	O
2017	O
,	O
and	O
an	O
anime	O
television	O
series	O
aired	O
in	O
Japan	O
from	O
October	O
to	O
December	O
2017	O
.	O
</s>
<s>
A	O
4-panel	O
manga	O
adaptation	O
is	O
serialized	O
online	O
via	O
the	O
official	O
Dia	B-Application
Horizon	I-Application
website	O
.	O
</s>
<s>
A	O
novel	O
written	O
by	O
Ghost	O
Mikawa	O
,	O
titled	O
Dia	B-Application
Horizon	I-Application
:	O
Akatsuki	O
no	O
Keiyakusha	O
,	O
was	O
serialized	O
online	O
via	O
Kadokawa	O
's	O
Kakuyomu	O
website	O
.	O
</s>
<s>
The	O
game	O
was	O
discontinued	O
on	O
May	O
31	O
,	O
2018	O
,	O
along	O
with	O
King	B-Application
's	I-Application
Knight	I-Application
,	O
another	O
Square	O
Enix	O
fantasy	O
mobile	O
game	O
.	O
</s>
