Not so far future, the world that we know suddenly changes dramatically due to the discovery of the utilised changes a new source of energy that humans can use called Zether. By discovering a new energy source, humanity combined this incredible energy with science, creating a new era of humanity, where they were able to traverse across the stars and galaxies.

With Zether, humanity's technology advanced to the point that it entered the territory of a god, travelling between dimensions and multiverses, travelling through time, etc. Humanity had achieved something that seemed impossible in the past; something that they thought only happened in fiction became a reality, and they have the power that is very close to a god.

But all of this does not last because one day, an enemy appears, an enemy that seems to come from a different universe; they called themselves the Kildaga. They are an extra-dimensional race that seems to have technology superior to the technology humans have, technology that the Zether does not fuel.

These Kildaga seem to have a massive hatred toward humanity for an unknown reason.

So a war ensures a battle across galaxies, time and space, dimensions and universes.

Ultimately, humanity lost the war, and those who survived are scattered across the universe. All they can do is run away from the Kildaga and hope to survive for another day.

Follow Yuriko or Yuri, an eccentric man with a sadist tendency, a man who the Kildaga want to kill badly for an unknown reason.

His journey is followed by Stella Vargo, a half-boiled detective woman who owns a detective agency called Rashomon: Zed Jerowalt, a short-tempered scientist-engineer/assistant of Rashomon and Loxu, their super-strong alien pet.

Follow their journey of running away from the Kildaga and uncovering their motive of wanting to exterminate humanity and finding out the truth about Zether and what it truly is.