Chapter One: The Reaper Enters Kuoh Academy

(Kuoh Academy's rooftop)

A young (appearance wise) girl can be seen sitting on the roof of Kuoh Academy. She seem… bored. She rests her head in her hands, with her arms leaning on top of a large, almost demonic-looking, briefcase. That's her sacred gear, Chaos Container: Pandora. Suddenly something catches her attention. A group of devils, more specifically, the occult research club.

"Hmm… devils huh? And they're attending at this school? I wonder what it's like. What if I… *mental scream in frustration* Fuck it! I've got nothing better to do! I'll enroll." she thought to herself.

(The next day, Issei's classroom)

The class was lively to say the least as the teacher told everyone to settle down. As they did, a girl with a messy mix of black and white hair stepped into the classroom. Her left eye was red like blood while her right eye was silver. When she took a look across the classroom, everyone felt a chill running down their spines. The most unsettling thing about, or rather with, her was her briefcase. It was pitch black with a golden demonic-looking horned skull at the center surrounded by golden (and thorny) vines. The skull and vines had purple gems in it's eye sockets and at seemingly random parts of the vines, making the gems look like purple roses. The teacher decided to clear his throat in order to catch everyone's attention.

"Alright everyone listen up! As you can see, we have a new classmate joining us." he said as he gestured towards the new girl. "Now why not introduce yourself?"

"Right. My name is Shinu Tartarus, and I hope we can get along." the girl, now identified as Shinu, said while lifting her briefcase higher. "And by the way, stay away from my stuff." she said, and followed up, to put emphasis on her point, lightly shake her briefcase sideways. "Any questions?" She answered the most common questions, like if she was single or not, without much care until one question caught everyone off-guard. It was not only the question itself, but also the one who asked it, Issei.

"Where did you get that, somewhere in between cool and scary, briefcase?" To say that nobody saw that one coming was an understatement. After a few seconds of thinking gave Shinu, Issei an answer.

"I didn't buy it, if that's what you're asking. I made it by myself." she said, and thus ending the Q&A-session.

(Lunchtime)

The day was fairly normal. Although some people noticed that some of the plants that Shinu had been standing next to had died. Shinu herself had for some reason been called to the student council's office. Upon entering she noticed two particular faces that didn't belong there. Rias Gremory and Akeno Himejima. And the looks she received from them were not friendly ones. After a few seconds of silence decided Rias to break it by starting to ask Shinu questions.

"Who are you, and why is a reaper here?"

"The name is Shinu Tartarus, and as for why I'm here, at Kuoh, I was bored, so I decided to enroll."

"Okay." said Rias in skeptical way. "That briefcase of yours, it's your sacred gear, isn't it?"

"Yup. It's my sacred gear alright. The Chaos Container: Pandora. Also known as Pandora's box. It has about six hundred and sixty six different and generally highly destructive weapon-forms. And this is it's sealed form." said Shinu while lifting her sacred gear and pointing at it.

"Alright, final question. Would you like to join the occult research club?"

"If it involves making meetings with stray devils and the possible opportunity to kick some stuck up devil's ass? Count me in."