According to Kouno the game will be largely story-driven as far as the narrative is concerned, but at the same time there seems to be a large degree of freedom in where you can go, what you can explore, how you go about doing things, etc. There isn't much info out on the story but I would think since the entire game design is so inspired by western PC space sims, the narrative flow would be similar too. Nudemaker has ever made a traditional JRPG ever, so there's no reason to expect one here.