My story writing approach for this series is "chaos before control". It starts with unloading characters, themes, locations and rough story ideas onto a page then doing some visual and thematic research to see which concepts have legs.
With a few solid stories I establish a guiding theme for that issue which compliments the broader themes of the story world. These themes are used as the filter for redrafts and key narrative decisions. With the first drafts written it's time to revisit designs.