Neptunia: Sisters VS Sisters

While the Goddesses were responding to a distress call from the distant PC Continent, Nepgear and the other Candidates were sent to an abandoned research facility to investigate a monster outbreak.

There, they encountered the Ash Goddess, who trapped them in a capsule and put them into a deep sleep. When they woke up, they were surprised to find that 2 years had passed.

When they woke up from their sleep, they learned that Neptunia had been missing since her mission to the PC Continent 2 years ago, and in the absence of its Goddess and Candidate, Planeptune had been devastated by a series of strange outbreaks, collectively referred to as the Trendy Phenomenon.