Within the safety of the walls, youths are raised in a nursery-style
setting by robots. While life there may appear stale on the surface, the
children are full of potential and curiosity. In many ways it is like a
slice of heaven.
The outside world is a hell-scape. It is almost entirely void of
anything mechanical and is now inhabited by bizarre, yet powerful
super-natural beings.
Maru, with the aid of Kiruko, is out there crisscrossing what was once
Tokyo for heaven. But after searching for so long, maybe heaven is more
of an untenable dream than a potential reality.