Well, obviously Kagome isn't a hero.

"Coming!"

And she leaves the sacred tree behind her, and goes inside to eat dinner and some cake, one day late.

And just when her family's sitting down to dinner, Inuyasha kicks the front door open!

"Hey girl, new demon, break's over."

For a moment, the dinner table is deathly silent.

"Can anyone just walk through that thing?"

"Hell if I know. C'mon, let's get going."

It makes no sense. You can't just walk between centuries whenever you want. That's not how time works, or how stories work, either. It's not even supposed to be how magic works! The well is supposed to be closed! Even if it isn't closed, Inuyasha said he didn't want her help anyway!

Sensible or not, though, the decision is the most natural thing in the world, like she's already made it and just didn't realize. She pushes away from the table and stands up. "What's happened?"

"Everyone back at the village got puppeted by some demon witch, old hag couldn't see the control well enough. You coming?"

(It's not immediately obvious, but Inuyasha has a lot of very-rapidly-healing small cuts; it looks kind of like they might be papercuts, and by this point they're almost completely gone.)

"Yeah! - wait one second!"

She bolts off to her room and dumps her backpack full of textbooks unceremoniously out on the bed, and then starts throwing in anything that seems like it might be useful in the 16th century. First aid kit, flashlight, duct tape, aspirin, alarm clock, she's probably gonna want a change of clothes when this one gets wrecked too, random crap that happens to be lying around on her desk...

If everyone's in danger now, then seconds count (actually, do seconds count, if it's time travel? - but if they do count she doesn't have them to puzzle through this), but if she only gets one second chance, and not two, then she'll be kicking herself if she doesn't try to bring anything at all with her. She frowns at her bag, throws the science and history textbooks back in, zips it up, and heads out.

"Ready!"

"But Kagome, you were almost killed last time!"

"I know." And she could very easily be killed this time. 

" - but you'll be helping this time, right?"

"Me, help you? It's you who's helping me collect the shards!"

"Which I can't do if I'm dead, right?"

"Can't use your eyes when they've been cut out of your head, now can I?"

Her family doesn't look very reassured by this, at all, but Kagome nods decisively.

"I love you guys. But - I gotta do this," she says, and then runs off towards the well.

Inuyasha will, of course, run with her.

To the well!

"You said the villagers are being puppeted?"

"The old hag said it, but yeah, they were hovering."

Well, that's really not much information to be going into... whatever this is with... but she doesn't seem very likely to get a complete breakdown, here.

She takes a deep breath, and looks down the well.

"...you first?"

He hops down!

And lands.

And glares at the bottom of the well like it is personally responsible.

Huh.

" - can't you go back?"

"You tell me, it's your dumb well!"

"I don't know how it works! - hang on."

And she can jump down into the well.

And she falls through a weird glowing space and appears at the bottom of the well in the Warring States era!

The mouth of the well is blocked, almost completely, by a black mass of ?hair?, densely strung like a spider's web to block all egress from the well.

Well, at least she's over.

....without her dubious bodyguard demon, and with an obvious trap set at the top of the well, which is not, uh, the best starting situation one could hope for....

Her dubious bodyguard demon arrives five seconds later.

"Hey."

Then he reaches to pick her up so they can superjump out!

Oh good!