New idea... Not sure where to go with it...
Post-manga Ranma 1/2...
Nabiki is dreaming of the events of the events of the past week...
Something happened over a week ago where Akane's
"I'm-a-Martial-Artist-Too" attitude almost gets the Tendos and others
killed, but are rescued by Ranma and Soun (whom Ranma has been
[re-]training and Genma is living with Nodoka)... The result fallout
is that Akane has completely discredited the Tendo Dojo beyond repair
and has once again broken the engagement between herself and Ranma. In
Nabiki's dreams she goes to comfort him and makes him stay with her,
but in reality she was too surprised and upset at Akane to do
anything.... Ranma in a formal tone tells Soun that at this point, the
Engagement isn't going to work, and heads out...
For the first couple days, Soun does try to train Akane, but she's
won't accept it... Akane begins to avoid the home as much as
possible... So Soun trains alone for the next couple of days... At
first, this makes Nabiki think of Ranma, but slowly that changes to an
image of a depressed Ryouga...
Early morning a week later from Ranma's leaving, Nabiki is awoke by
Kasumi, whose wearing an outfit like Taki from Soul Calibur. Kasumi
explains that she's leaving home for good, everything that's happened
that week is the same thing that happened when Mrs Tendo died, Soun
and Akane are repeating themselves and Kasumi doesn't want to be around
this time ... probably in search of Ranma, whose been secretly
training her, and/or going to go join the fighting circuit...  Kasumi
has left breakfast and sandwich for everyone... Kasumi's original plan
was to challenge and beat Akane for the Dojo, but because of Akane's
action, the Dojo is figuratively destroyed forever...
Kasumi explains that it was always understood that Kasumi would be Mrs
Tendo's Heir to her kenjitsu style, Akane would be Soun's Heir to
Anything Goes, and Nabiki would go to college and handle the business
of both, to which end, Mrs Tendo set up a college fund for her back
when Nabiki was born, so Nabiki go to any college she wishes and live
up the interest for a while...
After talking with Nabiki, Kasumi jumps out her window and Kasumi
Tendo is never heard from again... Kasumi uses her mother's
maiden-name from then on...
Nabiki is fearful that if she stayes she'll get trapped like Kasumi
was until Ranma came... and she knows lightning doesn't strike twice
like that...
Not sure where to go with this...

I) Ranma goes to a/the fighting circuits
	a) either Street Fighter or King of Fighters, or original
	b) Ranma has been very hurt by his fiancees and all, so he is
		very distructful of females, in general, and agreesive,
		tomboys, specifically, like his fiancees
	c) Ranma's fighting circuit "nickname" is "Ladykiller" due to his
		"popularity" with the female "fans" and not holding back
		against female oppoents (which has ended a number of
		careers, of course, most of those were Kuno/Akane wannabes)

II) Kasumi 
	a) seeks out Ranma, and joins him as husband/master and
		wife/student or as just friends...
	b) joins the fighting circuit on her own...
	c) understands I.b and tries to help him...

III) Nabiki
	a) seeks out Ranma as husband/instructor and wife/business or
		just as friends
	b) understands I.b and tries to help him...
	c) joins with Kasumi

IV) Akane
	a) seeks out Ranma to kill him for destroy her life and family,
		and setting her family against her
	b) joins the fight circuit
		-	as a berberker
		-	gets crippled
		-	is killed