[[WMG: ''FutariWaPrettyCure'' is set in the same universe as ''MahouSenseiNegima'']]
[[http://www.mangareader.net/209-14924-4/mahou-sensei-negima/chapter-91.html Evidence: Nagisa and Honoka appearing at the Mahora Festival in the fourth panel]].
How did they end there? Well, after the Dark King attacked Earth directly the mages finally tracked the Pretty Cures, and to keep TheMasquerade offered them a scholarship and training in Mahora. It would also explain how they became able to one-shot a Zakenna in the All Stars movies: the training paid off.
** The panel shows Cure Black with her midriff outfit which she wore in the first season. It would have happened during the first season.

[[WMG: [[Main/{{FutariWaPrettyCure}} Futari Wa Pretty Cure]] is indirectly based on events in the past of [[Anime/{{FutariWaPrettyCureSplashStar}} Futari Wa Pretty Cure Splash Star]].]]
We know from Saki's English quiz that ''some'' TV show called Pretty Cure exists in the ''Splash Star'' universe. According to an early episode, there's been at least one Pretty Cure in the ''Splash Star'' universe prior to Saki and Mai. It's not unreasonable that the two might be connected.

In the distant past, Dark Fall made an attempt to capture the seven fountains. A pair of women named Nagisa and Honoka, aided by the spirits Mepple and Mipple, fought them off and won, but didn't quite manage to wipe out the bad guys. (Possibly, they never realized Goyan was the real [[Main/{{BigBad}} Big Bad]].) Their story was known in part by the [[Main/{{Muggles}} Muggles]] and, through repetition, it lost details (such as Uzainas being produced from different things depending on who creates them), and some things got mixed up.

Fast forward to the modern day, where some Toei exec decides that a modernized version of the old Pretty Cure "myth" would make a ''great'' anime. Nagisa and Honoka were recast as schoolgirls, with the added "complete opposites" angle, and new names were made up for everything whose real name was forgotten. The Hikari angle was probably invented as an excuse to extend the show for another year as ''Max Heart''. (Alternatively, perhaps instead of the Queen being restored to her original form, the real Hikari regained the Queen's power and memories in her current body, becoming the Filia we know.)

Since both the legend and the TV show are well known, Flappy assumes Saki and Mai will instantly understand how this Pretty Cure thing works. This is why he's so uninformative about it at first and irritated when they need things explained to them.

* The {{fanfic}} version, ''Futari wa Hearty Pure'', is confirmed to be based on such a legend, only this time with the two women being renamed Nadeshi and Hanako like in the series, in an early episode of FanFic/PrettyCureHeavyMetal.

[[WMG: Cure Black is a Franchise/KamenRider disguised as a magical girl.]]
Cure Black's voice actress Creator/YokoHonna had a recurring role in ''Series/KamenRiderBlack''.
* Is WesternAnimation/AtomicBetty is also a Kamen Rider? (Creator/YokoHonna voiced WesternAnimation/AtomicBetty in Japan.)
* In ''Heartcatch'', Tsubomi's mother's maiden name was [[Series/KamenRiderKuuga Kaoruko Godai]]. Within a couple of days of that fact being revealed, [[http://i375.photobucket.com/albums/oo199/WingKnightZero/1281919185983.png this piece of fanart]] appeared.

[[WMG: Cure Black is a magical [[ComicBook/{{Watchmen}} Silk Spectre II]].]]
Same reason as above, only this time Honna was also the seiyuu for Silk Spectre II in the Japanese dub of Watchmen.

[[WMG: Nagisa and Honoka became HeterosexualLifePartners after the end of Max Heart]]
Their powers depends from their feelings for each other. Now, in the series Zakenna always gave them at least a decent fight, but in the first All Stars movie they one-shot ''two'' Zakennas in a row. My guess is that their powers have been brought UpToEleven with their feelings...