<s>
Island	B-Application
Days	I-Application
is	O
a	O
tower	B-Application
defense	I-Application
visual	O
novel	O
video	O
game	O
developed	O
by	O
Klon	O
in	O
collaboration	O
with	O
0verflow	O
for	O
the	O
Nintendo	B-Operating_System
3DS	I-Operating_System
.	O
</s>
<s>
It	O
is	O
a	O
spin-off	O
of	O
0verflow	O
's	O
School	B-Application
Days	I-Application
visual	O
novel	O
series	O
,	O
and	O
was	O
released	O
in	O
Japan	O
on	O
July	O
3	O
,	O
2014	O
.	O
</s>
<s>
The	O
battle	O
part	O
is	O
a	O
tower	B-Application
defense	I-Application
game	I-Application
,	O
in	O
which	O
Makoto	O
and	O
the	O
girls	O
must	O
protect	O
their	O
food	O
supply	O
from	O
wild	O
animals	O
.	O
</s>
