The story takes place in 2998, where humankind has reached a great point in intergalactic travel and space colonization with the help of a peaceful society, however a mysterious space matter known as Black Nebula appeared and begins engulfing different stars before reaching latest colonized galaxy by humans.
In the year 2998, humanity has made remarkable progress in space exploration and colonization thanks to a harmonious society.  However, a strange phenomenon called the Black Nebula appears and starts devouring stars, eventually threatening the most recent human-built galaxy.