As the world is in dire status the lone traveler surfs through the world unworried with a smile on his face, completely enjoying his journey throughout his path, fruited with fantasies and new experiences, however all of that journey is nothing but a mere façade to a work full of conflicts, that's the sentry's work.

Imagine being bound to an unforgiving new reality, where the stars fall from the sky, transporting an alien species to take over the world.
On a fateful day, humanity awakened an alien species called "Alcatail" hidden away for eons. Taking over the world in a matter of minutes, they are the proclaimed rulers of the new era. When this new era has taken everything away from a young girl, she promises to eliminate all the Alcatail race. With an impossible dream, considering these creatures are ten times more potent than humans, the only way to eliminate them is by mastering their own foreign weapons, and advanced alien technology. Not to mention, the myth of an organization doesn't want anything to do with Eden, until she can prove she is capable to lead a team. In a mission to restore the world, by traveling across it, she will have no choice but to join. The last thing she wants to do in this post-apocalyptic world is be burdened by others!

a boy named Marco is an orphan who lives with his little brother on their own after their parents' death and their grandfather disappearance, with him working hardly everyday a fortunate or rather unfortunate turn of events on his 18th birthday, makes him discover a whole hidden society with supernatural powers , in that aspect begins his long journey of twisted events