You were walking down the street when you saw someone wearing the same exact uniform that you are currently wearing, but with a haircut you recognized.

"Issei?"

Issei: "Y/N? What brings you to town?"

"My dad has started a business here, and it's going to be a while, so he's enrolling me at Kuoh Academy."

Issei: "Kuoh Academy? That's my school."

"Really?"

Issei: "Yeah, I can show you around. Heads up, the boys are attracted to pretty girls, and the girls are attracted to handsome guys, so you'll probably see the girls admiring you and have to face jealous guys."

"Well, that's unexpected, but thanks for the heads up."

Issei: "No worries, man. I just can't wait to catch up after all this time."

"Yeah, It's been years."

The two of them go to Kuoh Academy and, upon entering, you witnessed most of the girls starting to become attracted to you, just as Issei said.

After class, you and Issei sat outside the club building and discuss what happened since you last saw each other.

Issei: "So, Y/N 'Redgrave', how's your dad? I really want to thank him for saving me when I got in that accident. I really thought I was going to die that day."

"He told me that you don't need to thank him. He considered it paying you back for being my friend."

Issei: "Your father was something."

You and Issei hear a window open and saw a beautiful girl with crimson hair and green eyes looking out the window.

"Who was that?"

Issei: "That's Rias Gremory. She's third year and president of the Occult Research club. She's also the most popular girl at this school alongside Akeno Himejima. Akeno is also the Vice-President of the Occult Research Club."

"I felt something... supernatural about her aura."

Issei: "Yeah, she has that effect on people. Funny thing, I sometimes overhear her and the other members talking about some students who were apparently here but disappeared. The weirdest part is that no one at school remembers them, but I have a strong feeling that I was seeing them until recently."

"Interesting."

You headed back to class, but unbeknownst to you, Rias was still looking out the window.

Rias: "Those two boys. I felt something strange about them. I wonder who they are."

After school, you and Issei left the academy.

"No offense Issei, but your friends are a bunch of goddamn embarrassments."

Issei: "Yeah, Matsuda and Motohama do that a lot. I'm lucky to be able to say no at every turn and avoid getting hated, although I do have a strange feeling I ended up across something familiar."

"Feeling?"

Issei: "After that surgery, I can't seem to remember three weeks of my childhood. Just leaves me wondering from time to time."

"If it was worth remembering, you'd remember it."

Issei: "I guess. See you tomorrow then?"

"I suppose."

After walking away, a strange bat-like creature flew around, with Rias Gremory watching through the eyes of the creature.

Rias: "Issei Hyoudou and Y/N Redgrave. The latter is a recent transfer. I should watch over them for a bit."

She then noticed a black vehicle that suddenly moved and picked up people from areas that you and Issei have passed.

Rias: "I've got a bad feeling we have more than just Fallen Angels and Strays to worry about."

You returned home and lie on your bed.

"That bat thing was following us for a bit. Same as those people. Dad, I hope your fears don't come true."

You closed your eyes and ended up on a black rock platform in a large white space. You then saw a large black and silver dragon with metal-like skin encased in a diamond-shaped cage.

The dragon opened its eyes and looked at you.