Hyperdimension Neptunia series is a series of (mostly) JRPGs that take place in a world known as Gamindustri, a world ruled by four goddesses that are the personifications of game consoles. The game parodies the real life gaming industry and is full of references regarding events in gaming history as well as references to a wide range of media such as other games, anime, and even manga.
Developer: Idea Factory, Compile Heart
Publisher: NIS America
Platform: PS3
MSRP: $29.99
Best Girl: 2-way tie: Nisa, 5pb
Release Date: August 19, 2010 (JP) March 4, 2011 (NA) March 31, 2011 (EU)
Hyperdimension Neptunia mk2
Developer: Idea Factory, Compile Heart
Publisher: NIS America
Platform: PS3
MSRP: $29.99
Best Girl: 4-way tie: Nepgear, Falcom, Nisa, 5pb
Release Date: August 18, 2011 (JP) February 28, 2012 (NA) February 24, 2012 (EU)
Hyperdimension Neptunia Victory
Developer: Idea Factory, Compile Heart
Publisher: NIS America
Platform: PS3
MSRP: $29.99
Best Girl: 4-way tie: Nepgear, Abnes, Histoire, Neptune
Release Date: August 30, 2012 (JP) March 21, 2013 (NA) March 15, 2013 (EU)
Hyperdimension Neptunia: Producing Perfection
Developer: Idea Factory, Compile Heart, Tamsoft
Publisher: NIS America
Platform: PS Vita
MSRP: $39.99
Best Girl: Blanc
Release Date: June 20, 2013 (JP) June 3, 2014 (NA) June 6, 2014 (EU)
Hyperdimension Neptunia: Re;Birth 1
Developer: Compile Heart, Idea Factory, Felistella
Publisher: Idea Factory International
Platform: PS Vita
MSRP: $29.99
Best Girl: 4-way tie: Tekken, Histoire, Mini Falcom, Blanc
Release Date: October 13th, 2013 (JP) August 26th, 2014 (NA) August 27th, 2014 (EU)
Hyperdimension Re;Birth 2: Sister's Generation
Developer: Compile Heart, Felistella, Idea Factory
Publisher: Idea Factory International
Platform: PS Vita
MSRP: $39.99
Best Girl: 4-way tie Nepgear, Falcom, 5pb, Tekken
Release Date: March 20, 2014 (JP) January 27th, 2015 (NA) February 6th, 2015 (EU)
Hyperdevotion Noire: Goddess Black Heart
Developer: Compile Heart, Sting
Publisher: Idea Factory International
Platform: PS Vita
MSRP: $39.99
Best Girl: 5-way tie Wyn, Saori, Lee Fi, Ai Masujima, Estelle
Release Date: May 29, 2014 (JP) February 24, 2015 (NA) February 27, 2015 (EU)
Hyperdimension Neptunia U: Action Unleashed
Developer: Tamsoft
Publisher: Idea Factory International
Platform: PS Vita
MSRP: $39.99
Best Girl: Nepgear
Release Date: August 28, 2014 (JP) May 19th, 2015 (NA) May 22, 2015 (EU)
Hyperdimension Neptunia Victory 2
Developer: Idea Factory, Compile Heart
Publisher: Idea Factory International
Platform: PS4
MSRP: $59.99
Best Girl: Uzume
Release Date: April 23, 2015 (JP) February 2, 2016 (NA) February 12, 2016 (EU)
Hyperdimension Neptunia Re;Birth 3: V Generation
Developer: Compile Heart, Felistella
Publisher: Idea Factory International
Platform: PS Vita
MSRP: $39.99
Best Girl: Nepgear
Release Date: December 18th, 2014 (JP) June 30, 2015 (NA) July 3, 2015 (EU)
MegaTagmension Blanc + Neptune VS Zombies
Developer: Compile Heart, Tamsoft
Publisher: Idea Factory International
Platform: PS Vita
MSRP: $39.99
Best Girl: There are no winners here
Release Date: October 15, 2015 (JP) May 10, 2016 (NA) May 13, 2016 (EU)
Superdimension Neptune vs Sega Hard Girls
Developer: Compile Heart
Publisher: Idea Factory International
Platform: PS Vita
MSRP: $39.99
Best Girl: Segami
Release Date: November 26, 2015 (JP) October 18, 2016 (NA) October 21, 2016 (EU)
Cyberdimension Neptunia: 4 Goddeses Online
Developer: Idea Factory, Compile Heart
Publisher: Idea Factory International
Platform: PS4
MSRP: $49.99
Best Girl: Noire
Release Date: February 9, 2017 (JP) October 10, 2017 (NA) October 13, 2017 (EU)