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Superdimension Neptune vs Sega Hard Girls

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Superdimension Neptune vs Sega Hard Girls


NeptuneVSSegaHardGirls LE


Felistella, Compile Heart, Idea Factory


Playstation Vita



External Link(s)

Official Japanese Website


Superdimension Neptune vs Sega Hard Girls (超次元大戦 ネプテューヌVSセガハードガールズ 夢の合体スペシャル Chou Jigen Taisen Neptune VS Sega Hard Girls Yume no Gattai Special) is a spinoff crossover game for the Playstation Vita in development by Compile Heart, Felistella and Idea Factory. It is a crossover video game between the Hyperdimension Neptunia and Sega Hard Girls series.

Both games have most likely been crossed due to bearing similar premises; both Hyperdimension Neptunia and Sega Hard Girls focus on anthropomorphised video game consoles personified as humans. The Sega Hard Girls represent past SEGA consoles (hence the name), while the Hyperdimension CPUs represent present-day consoles such as the Xbox, Playstation, and Nintendo consoles.


In a desolate, post-apocalyptic world, IF roams the landscape as an adventurer, searching for the library housing all the world's knowledge. Along the way, she catches a girl falling out of the sky and takes her along. After finding the library and chatting with the librarian, Histoire, IF is suddenly attacked. It turns out that someone or something is erasing the history for the world, causing damage to the timeline. IF and the girl Segami team up to investigate, using a time machine Histoire built into IF's bike.
Traveling back to the era of Sega Saturn and Neptune, Segami comes to believe that the escalating conflict between the CPUs and Sega Hard Girls will drive the world to its current state and attempts to stop the feud between the two, despite IF's desire to avoid changing history. Eventually, the CPU and Sega Hard Girl prepare for a showdown when history begins to disappear around them. Purple Heart sacrifices herself to save IF and Segami, who return to the present. The initial disheartened scene after is suddenly changed when it's revealed that Neptune's soul has somehow become imbued in IF's bike, allowing her to talk and drive herself. The three then agree to investigate other eras as well.
As they investigate, IF wonders if someone or something is behind these events, causing Segami to remember the true cause of these events: the Time Eater, a monstrous beast that consumes time to strengthen itself. After an attempt to defeat it ends in failure, IF, Segami and Neptune suddenly finds themselves back in time to their first meeting. This results in the history that was eaten having been restored, giving them a second chance at fixing the timeline.
In the Mega Drive era, Mega Drive believes Plutia will be a corrupting influence on the populace and attempts to stop her. In the Game Gear era, both Nepgear and Game Gear are in hiding due to games having become taboo. And in the Dreamcast era, Uzume and Dreamcast engage in all-out warfare for dominance. Despite their best efforts, IF, Segami and Neptune are unable to resolve the conflicts and history plays out as normal. As these events are viewed and restored, their respective goddesses join the party in the library.

Endings Edit

Bad Ending Edit

Normal Ending Edit

Best Ending Edit


This section in need of expansion, help out the Hyperdimension Wiki by contributing what you know.



  • According to speculation and concept art, IF is set to be this game's protagonist.
  • Dark Rose Valkyrie which was improved based on the game system of this work was released on July 21, 2016.

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