you're a ninja?

- Not quite.

I'm still in training.

But Sensei says if I guard the Fifteen Sacred Trees really well, he'll make me a ninja.

- Who's Sensei?

- My teacher.

He's the coolest.

He even taught me how to disappear.

- Wow!

Can you show us?

- Please, please, please!

- First, you make a cloud of smoke with a smoke ball.

Then, you jump up into a tree, so when the smoke's gone, so are you!

Smoke bomb!

(Cat gasps.)

- She disappeared!

(Aki groaning with effort) Well, her head did anyway.

- Ah, you gotta start somewhere.

- Aki can't keep herself up!

- So I can't disappear!

And if I can't even disappear, there's no way I'll be able to guard the Fifteen Sacred Trees!

- Aki's got a BIG PROBLEM!

(wind blowing) There must be some way to help her!

Hey, that's it, Cat!

- Hm?

- Aki can't keep herself up 'cause she got too much heavy ninja stuff.

- I do?

- Listen, Aki, if you're gonna be light on your feet, you can only carry one of each thing.

We'll help you get rid of the extra stuff using our... - (both): Math skills!

- You have three ropes.

To get down to one, you take away... - One, two.

-♫Take away two ropes if you will♫ - One, two ropes!

Math skills!

-♫Peg, what's that line?♫ -♫That, my friend, is the minus sign♫ It means the same thing as take away.

Like a sword cutting away all the extra stuff.

- That's so ninja!

- Three minus two equals one rope left!

- I have three flashlights.

To get down to one, I take away?

-♫Take away two - Will do♫ - Three minus two equals one flashlight!

- Great!

Now, I have two apples.

To get down to one apple, I take away one.

-♫So two minus one equals one♫ -♫Ah, indeed The deed is done♫ Whoa-oh-oh!

-♫Now, I'm feeling so light♫ -♫You're gonna be alright♫ -♫Thanks to that very cool line♫ - (Peg and Cat): The minus sign!

- Smoke bomb!

- Where did she go?

- Up here!

Woohoo!

- She did it!

Aki was light enough to do the disappearing trick.

which means... ♫Problem solved, the problem is solved♫ ♫We solved the problem, problem solved♫