Not a flow chart persay but really if you want to know what anything is your best bet these days are the various 'sub-Wikis' out there.http://hyperdimensionneptunia.wikia.com/wiki/Hyperdimension_Neptunia_Wiki
Reserved Edit: (Done.)List of Neptunia Games; Organized by Cannon & ChronologyOriginal CannonHyperdimension Neptunia
Hyperdimension Nepunia mk 2
Hyperdimension Neptunia VictorySpin Off Miku Hatsune CloneHyperdimension Neptunia: Producing PerfectionAlternate Dimension CannonHyperdimension Neptunia Rebirth1
~ Rebirth 2
~ Rebirth 3The next two I believe go between Rebirth 2 & 3.
(Terrible) Spin Off Dynasty Warriors CloneHyperdimension Neptunia U: Action UnleashedSRPG Spin Off GameHyperdevotion Noire: Goddess Black Heart??? Cannon (No one knows yet if this is the original cannon or the Rebirth cannon)Shin Jigen Game Neptune VII
Also, whoever said the series has gotten better has liiiiied. XP I just traded in Re;Birth 1&2 after barely touching the second. I couldn't quite put my finger on what the biggest drain was until just yesterday and my wife agreed with the sentiment.
Neptunia's plot has effectively deleted all character conflict because it gets in the way of them being 'perfect waifus'.
Just compare the original Neptunia to Re;Birth1 in this one element for example. In that one all the CPUs were relatively hostile to Neptune at first and that tension slowly
wore down over the course of the entire game. Re;Birth1? You get many...5 second of wariness. Then it's gone. For no reason then just to rug-sweep it. To add to the problems...
Dungeons are just as bland, samey, and recycled as the original.
Grinding is still nightmarish, and good luck unlocking gear without a guide for which monsters to farm for drops because that crap gets convoluted quickly.
Dialog is still extremely hit or miss in the humor department.
Pandering fanservice has gotten 'worse' in that it utterly annihilates characterization. (I.E: IF used to be the 'straight man' of the group to counter balance the nonsensical humor vibe in the original. Now as soon as you meet Vert she devolves into "...booooooobs...*drools*" as her only trait for the rest of the entire game.)
Combat is still 'mash Square to win, tactics aren't needed.', despite using a completely revamped system.
Transformations have actually gotten WORSE because there's no longer any fun 'Sailor Moon' esque scene where you get to see your different parts snap on. Just a flash of light and 'done'.
Literally the only improvement over the original is the music. :-\
As for Re;Birth2? Exact, same, issues. ~_~