Hyperdimension Neptunia Wiki

Choujigen Game Neptune: Sisters vs Sisters (超次元ゲイム ネプテューヌ Sisters vs Sisters, lit. Super Dimension Game Neptune: Sisters vs Sisters), also known as Hyperdimension Neptunia: Sisters vs Sisters, is an orthodox spin-off RPG for the PlayStation 4 and PlayStation 5. This game follows Nepgear and the CPU Candidates waking up to a Gamindustri two years after the Buzzoer Phenomenon terrorized the four nations.


Handhelds vs. smartphones—the little sisters’ portable revolution that began over time…

That day, the four CPUs set off in response to a request for help from the PC Continent far beyond the sea, while Nepgear and the other CPU candidates that stayed behind visited a certain research facility.

There, they were trapped in a capsule and put into a deep sleep by the “Gray CPU,” and awakened to a Gamindustri two years later.

People now had the latest model of smartphone, called the “MagiPhone.” It became a world in which the market share was dominated by smartphones.

Nepgear is told that Planeptune fell to the “Buzzoer Phenomenon,” in which hordes of monsters to appear, and that her older sister Neptune went missing.

Having lost her sister and a home to return to, Nepgear fell into despair.

This is a story of destruction and restoration, by CPUs, for CPUs, to pave the way from a future of despair, to a future of hope.[2][3]

Hyper Dimension

Nepgear and her friends live in a world called "Gamindustri".

The land under Purple Heart's protection, Planeptune.
The land under Black Heart's protection, Lastation.
The land under White Heart's protection, Lowee.
The land under Green Heart's protection, Leanbox.

The four nations were affected by the "Buzzoer Phenomenon", in which a massive amount of monsters appeared, and now the people refrain from going out, leaving the streets deserted.

Probably due to the advent of smartphones called "MagiPhones", that are affecting the Shares ratio, the access to the world called "Ultra Dimension" has been severed.

With the direct communication's means cut off, now the people are connected through their smartphones.

PC Continent

A continent far beyond the sea.
A place where PC and indie games thrive.
There are as many creators and games as there are on the continent where Nepgear and her friends live.

Buzzoer Phenomenon

A phenomenon in which a massive amount of monsters suddenly appear.
Since it occurs at irregular intervals without warning, the nations are having serious problems to deal with it.
Due to the Buzzoer Phenomenon, Planeptune has fallen.


A recent smartphone model.
It's said there is no person who doesn't own one these days.
As they are used for SNS, games, and assistant functions, people's dependent on them.


Main Article: Hyper Dimension

This game takes place after the events of Megadimension Neptunia VII, with Gamindustri left in ruins by the Buzzoer Phenomenon.



CPU Candidates

Voiced by: Yui Horie (Japanese)
CPU Candidate of Planeptune and Neptune's little sister. An earnest and reliable girl who loves her big sister.
While investigating a certain research facility, she was trapped in a capsule and put to sleep, waking up in Gamindustri a few years later.
In order to restore her lost Planeptune, she, alongside her friends, will go on an adventure.
With her HDD she can transform into Purple Sister.
Voiced by: Eri Kitamura (Japanese)
CPU Candidate of Lastation and Noire's little sister. A hardworking girl who loves firearms.
Waking up in Gamindustri a few years later, she works with Nepgear to restore Planeptune.
She's worried because Noire hasn't contacted her since she woke up.
With her HDD she can transform into Black Sister.
Voiced by: Yui Ogura (Japanese)
CPU Candidate of Lowee and Blanc's little sister. She and Ram are twins, being Rom the older sister. A shy girl.
Waking up in Gamindustri a few years later, she works with Nepgear to restore Planeptune.
Despite her shyness, she keeps her calm and composed attitude while supporting Nepgear and her friends.
With her HDD she can transform into White Sister.
Voiced by: Kaori Ishihara (Japanese)
CPU Candidate of Lowee and Blanc's little sister. She and Rom are twins, being Ram the little sister. A lively and mischievous girl.
Waking up in Gamindustri a few years later, she works with Nepgear to restore Planeptune.
Even in a world where a huge amount of Shares has been taken away, she behaves cheerfully as always with Rom.
With her HDD she can transform into White Sister.


Voiced by: Rie Tanaka (Japanese)
The CPU of Planeptune. A high-tension girl with her natural brightness and energy. She goes to the PC Continent, but does not return to Planeptune, and is now missing.
With her HDD she can transform into Purple Heart.
Voiced by: Asami Imai (Japanese)
The CPU of Lastation. She is a tsundere girl who can't be honest. She has been deprived a huge amount of shares and is busy working to protect her country in a world chaotic due to the Buzzoer Phenomenon.
With her HDD she can transform into Black Heart.
Voiced by: Kana Asumi (Japanese)
The CPU of Lowee. She is a lover and a calm and quiet girl. She works with Histoire, including accepting refugees from Planeptune and PC Continent, as she suffers less from the Buzzoer Phenomenon than in other countries.
With her HDD she can transform into White Heart.
Voiced by: Rina Satou (Japanese)
The CPU of Leanbox. An older sister of a soft-mannered gamer nerd. She is the only one of the four goddesses with no sister. She has been restricted from going out and her contact has been cut off in order to protect her people from the monster damage caused by the Buzzoer Phenomenon.
With her HDD she can transform into Green Heart.


Higurashi When They Cry
Voiced by: Mai Nakahara (Japanese)
A friendly girl from the PC Continent in search of all things cute. She tends to try to take home cute babies and distinctive sculptures.
Shanghai Alice
Voiced by: Yua Nagae (Japanese)
An uncomplicated type from the PC Continent. She is earning a daily income after the Buzzoer Phenomenon ruined her journey.


Voiced by: Sayumi Suzushiro (Japanese)
A bright and cheerful girl who loves smartphones. She is picked up by Anri, who has evacuated from the PC Continent, where she had collapsed near Planeptune. She is good at software development, and she works with Anri to create observation instruments and works hard day and night to elucidate the Buzzoer Phenomenon.
Voiced by: Natsumi Ooshita (Japanese)
Creator from the PC Continent. She is a calm and knowledgeable girl. Refugees who have evacuated to the continent where Nepgear and others are located in the wake of the incident that occurred on the continent. She's an optimistic guardian towards Maho, and she often thinks about her and pays attention to her. She is devoting her efforts to elucidating the Buzzoer Phenomenon.


Gray Sister
Voiced by: Sayumi Suzushiro (Japanese)
An unknown CPU that holds the key to the story, and the culprit who put Nepgear and the other CPU candidates to sleep for two years.
Voiced by: Chiaki Takahashi (Japanese)
The revived form of the Deity of Sin.


  • Opening Theme: Fight for Victory by Ayane
  • Ending Theme: Nep-Nep na DAYS by Shibu3 Project
  • Soundtrack: Sisters Soundtrack CD



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