Most of humanity has been wiped out by mysterious dark monsters known
only as "Phantoms." Four survivors, who may well be the last of the
human race, have found one another and are sharing a quiet, peaceful
existence. These survivors are a kind, dependable teenage boy called
Masashi, two teenage girls, shyer Sanae and bolder Yaeko, and a little
girl called Anna. They feel as though they're just living in a perpetual
"after school" state, waiting for the rest of the human race to come
home. As they pass their days together, they begin to see some strange
things and find that the monsters have not yet left the Earth. Will they
discover what really happened to their planet?
