Hyperdimension Neptunia: Megami Tsuushin is the first manga series of the Neptunia franchise, taking place in a universe where all the characters exist in the same dimension.
Story
There was a parallel universe called, Gamindustri. A long time ago, in Gamindustri, a big incident took place. But the conspiracy of the four continent's hard driven goddesses, crushed it and brought peace. This is the story of what happened after the goddesses resolved the incident.