Trakal wrote:

"Shut up!" Ranma booted his father into the koi pond. "I still haven't
forgiven you!" He turned his back on him. "Stupid old man," he
grumbled.

"It's the same school Nabiki, Akane, and I go to," Futaba said, coming
down the stairs dressed in a school uniform. "If we're lucky, you'll be
in
our class."

I was going to ask if the fact that Futaba is wearing a school uniform
isn't a given under the circumstances, then I realized that would be the
case only for someone familiar with the Japanese educational system.

Actually there are Japanese schools that don't use uniforms.  Just not
many.

'Lucky, he says,' thought Ranma. 'The only luck I'll have is if I can
get
away from this house full of weirdos.'

"Bye!" Nabiki called as she sprinted out the door.

"Wait up!" Akane called as she ran down the stairs, grabbed her shoes,
and ran out the door, followed closely by Futaba.

Some apparent, though I could be mistaken, continuity problems here.
1. Futaba was ahead of Akane and while it said Akane ran down the
stairs it doesn't actually mention that she passed Futaba.

2. Wouldn't Akane's shoes be outside? Japanese people, from what I
understand, take off their shoes before coming into the house. However,
I am just starting to read this, so I digress that it mght have rained the
night before and that the shoes may have been brought inside in order
to keep them dry.

No.  You take off your shoes at the door and put them on a mat beside
the door.  In my part of Canada, we do pretty much the same thing.  

"Oh, did I startle you? This is just Betty-chan, my skeleton. Lovely
complexion, eh?"

LOL!  (reason for laugh: I saw the episode when Ranma first met "Betty-chan".)

"He?" Realization dawned on the doctor. "Oh, I see."

This seems a little vague. Does the good doctor know about Jusenkyo
or does he think Ranma's going through the early stages of a sex change
operation?

No, the doctor knows about the Shimeru.  The fic tells us that Tofu and the
Principal are the ones who have been trusted with the secret out of necessity.
Of course in Japanese the question wouldn't arise since Japanese doesn't use 
second person.

Ranma-chan followed, pausing just long enough to use the hot water to
change back to male once she was out of the doctor's sight before
continuing. He really didn't have time to explain the curse to the
doctor.

If the doctor did know about Jusenkyo, why would Ranma need
to explain it, or was Ranma too preoccupied to notice the look of
realization on Tofu's face a moment ago?

When has Ranma ever figured out what people were thinking by their
facial expression?  But if he did, he'd assume (correctly) that 
Tofu had lept to the wrong conclusion about his gender confusion.  

"Well, you see, this is Ranma Saotome. He's staying with us, and we
sorta need you to make the usual, um...arrangements."

"Ah. Say no more. One double registration comin' right up."

A double registration?! Does Principal Kuno know of Ranma's
curse already? I don't recall any mention of him having seen
Ranma change, although that is a possible explaination.

She just told Principal Kuno right then.  That's what she meant by the 
"usual arrangements".  However Kuno is assuming that Ranma is actually
a Shimeru...  

Watashi wa GP toko Tantei desu

Commenting on the fic itself...

I'm surprised that Akane goes to school as a girl.  Since she probably
still finds those boys aggravating, she'd probably normally go as a 
boy and switch back to girl once she got inside.  Perhaps she and Futaba
take turns dealing with the jerk squad and today was Futaba's turn.  

Regardless of whether Futaba saved Ranma from Kuno, he certainly saved
him from public exposure in front of the whole school.