You didn't read the manual. The story is in there. The story is also online here:
https://www.sinsofasolarempire.com/lore.aspx Also, the developers have a campaign planned for either a future expansion or as an inexpensive download add-on to the game.
SemazRalan
Disappointed. Son -a hardcore 360 player who grinds through games in 3-4- should enjoy this for a day or two.
There's your problem right there. Your approach to this game is that of a "hardcore" gamer and also a "360" gamer. To longtime PC strategy fans like myself and the people who made this game, you're quite frankly a "console noob".
That's not meant to be inflammatory, but it is meant to highlight the great divide that separates the last bastion of PC gaming, strategy games, from the fast paced action of console products. Games like this typically do not come with a campaign. This isn't Starcraft, Command and Conquer, or Warcraft. This is a totally different game with completely different design mechanics. What Sins offers as a campaign is roughly equivalent to Rise of Nations (and other RTS or 4x games) and its Conquer the World mode. The difference here is that Sins doesn't break things up by territory. A campaign literally consists of creating a huge map of a couple stars, adding in multiple opponents, and battling to either a diplomatic or extermination victory. It takes time, lots of save games, and continued effort over the course of hours, days, and weeks to complete a large map designed to be this game's campaign.
I'm not really interested in the idea of a campaign, personally, but I would love to see scenarios like in Sim City games or Smash Bros. games. Chaining scenarios into campaigns or mini campaigns is also welcome. There's so much more than can can be done in addition to the standard linked-missions campaign.