I know I probably shouldn't be doing this at 3 in the morning, but... here goes:

When the student came off the train and grouped up for the carriages, it was Botan, Yusuke, and Kuwabara in one, and Hiei, Kurama, and the mysterious Katana in another.

"Well, I'd rather be grouped with you two than a human, or Botan," Kata commented softly, climbing into the carriage drawn by Thestrals. The boys might not have noticed what she said at all if she hadn't muttered it in Japanese.

"What did you say?!" Hiei very much wanted to draw his sword, but Kurama had made him pack it in the truck.

"I'd much rather be in this small space with you two than, say, Kuwabara," she repeated keeping her voice low.

"Should we know you?" Kurama asked staying calm.

"Didn't Koenma tell you that you weren't the only detectives assigned to this mission? No, of course he didn't. That would have been the easier and smarter way to go," she didn't seem to get along very well with the little... never mind...

"So you're here after what's-his-name as well?" Hiei clarified.

"I believe his name is Voldemort," Kurama added.

"Yes, yes, all minor details. We can work out a plan when we have everyone together." Hiei looked at her as though she were insane for wanting to have the humans involved. "Well, we have to also include the boy prophesized to kill Voldemort. Unfortunately for us, he's a hormonal, 16-year-old, human boy."

"Just one more thing," Kurama said. "How do you know all this?"

"I have numerous sources," and she left it at that, remaining silent for the short time remaining of the ride.

When all the students (minus the first years) had assembled in the Great Hall, most were talking about was the group of six new students sitting at the end of the Gryffindor table. Hardly any of them had paid much attention to the Defense Against the Dark Arts teacher, a short, pink-haired woman, not much older than the seventh years deep in conversation with Dumbledor. Though one particular trio had their attention equally divided between the two.

"Yes, I met all six of them on the train," Hermione was saying to Ron and Harry.

"Alright," said Harry. "Do either of you know anything about the new teacher? She can't be nearly as bad as Umbridge, especially not if she has pink hair."

"I don't know anything about her, but look now. That Katana girl Hermione was talking about is talking to her and Dumbledor," Ron noticed.

"Now maybe we can find something out. Ron, have you got any Extendable Ears with you?" Harry suggested.

"Of course I do," Ron said pulling out three. After listening for a few fruitless moments, they gave up. "It's no good, it's all in Japanese."

"We noticed," said Hermione dryly.

Here is a translated version of the conversation:

"Excuse me, professors," Katana said as she approached. "I thought now might be a good time to discuss arranging a place and time for the collaborators of this to... work together. Because I don't think the house common room is exactly the best place."

"You never did like to waste time, Katana-san," Dumbledor commented.

"I doubt I ever will. Even though I have a lot of time, it is still valuable," she said, remaining serious. "I realize we cannot set the appointment now. I will go to Genkai-sensei's office after the feast to finish this, if that's all right with you. And just so you are aware, they already told at least one prefect, who has undoubtedly told a few others that we all came from Reikai Tantei School."

"I'll see you in my office later, then," Genkai assured her. "Bring the other tantei with you if you can."

"Oh, I'm sure I can manage," she said with a smirk.

"Katana, I don't want any students in the hospital wing on the first night," Dumbledor only half-joked.

"Don't worry, Botan has healing powers," she replied, turning away. The last comment didn't leave either with much confidence in her people skills.

Katana had decided to take the long way around the hall passing the Slytherin table accompanied by curious points and stairs. She wanted to see how the Slytherins were reacting to a whole group of new students coming in after O.W.L.s and being placed automatically in their least favorite house, Gryffindor. Needless to say, they were not taking it well. Along with the curiosity, the Slytherin students displayed open hostility in the form of jeers and sneers, which she ignored. Then her path was foolishly intercepted by a Slytherin prefect.

"As a Slytherin prefect, I demand that you tell me why you new students escaped the Sorting process," Malfoy pompously ordered, trying to make his power seem more than it was to what he thought was an unaware new girl.

"As your elder, I demand that you bugger off and not abuse the minimal power you have," Kata said smoothly.

"Wha-, you can't talk to me like that," Malfoy sputtered. "And you aren't my elder, we're in the same grade." He had, unfortunately, recovered himself quickly.

"Are you aware of the fact that you shouldn't irritate someone who gets along well with centaurs," she said menacingly.

Ron, Hermione, and Harry had decided to keep the Extendable Ears out when they saw the way she was going around the hall. They heard the exchange of words and decided they would make an effort to get along with anyone who could render Malfoy speechless on their first day. They had planned to try to talk to her when she sat down again, but she slipped out the doors when the first years were led in and everything quieted down.

I know you're dying to find out who the girl is, and I know the tantei didn't play a very big part yet, but not to worry. In the next chapter, you find out a whole bunch of things, and they all go to the meeting.