Prologue

Zero Marchodias an average looking man and professional NEET. Zero is a hacker...he wasn't a famous hacker like any other hacker in the world. He is just a professional hacker who steals a bank in different countries. No one knows who hacked a bank because Zero has been secretly doing it without anyone knowing.

This man I, the author, has been talking about is currently at an anime store looking for another manga to read. He was holding two books on his hands. The other one is a 'Highschool DxD' vol.1 manga and 'Danmachi' vol. 1 manga. He doesn't know what to choose because in the forum, the others said Highschool DxD is the best but the others said that Danmachi is the best anime.

Zero sighed and thought, 'Should I chose them both? But I can't read another manga while I am still reading another manga. I'll become confused.'

Suddenly someone tapped Zero's shoulder. Zero turned his head and saw an old man beggar. Zero thought, 'What is he doing here?'

"Young man, can you give this old man food?", he asked.

Zero was confused and said, "I don't have a food but I have money. Are you perhaps hungry?"

The old man just nodded.

Zero sighed and give the old man '100 000' yen, "Start a business with that. It may help you in the future."

The old man smiled widely and grab something on his dirty bag. He gave Zero a black book.

"This would help you in the future.", the old man said

Zero take the black book and open it but there was nothing on the pages. He sweat dropped and smile at the old man, "Thank you."

"Ah...you should pick Highschool DxD. I recommend it.", he said and leave while carrying the check of 100 000 yen.

Zero shrugged and buy the 'Highschool DxD' vol. 1 manga. After that, he leave with a black book and manga in his plastic bag.

Zero reached his villa and enter. When he entered, he feel an omnimous aura inside. Suddenly black clothed people with masked carrying a weapon on each of their hands. They were the assassins who wants to kill him a long time ago but they wasn't successful. This assassins wants to recruit him as a hacker so that they can steal a lot of money but Zero refused because he doesn't want them to have HIS money. All of the banks in the world is his territory and he gained a lot of money without working so hard.

Zero sighed and let go of the plastic bag. When he let go the two books fell, the books are now open. Zero ignore it as he started fighting with this assassins.

As he was fighting, he didn't know that his blood is now on the black book. The black book glows and started to have writings in it. Zero continued fighting but one assassin manage to stab him to his back. Zero coughed blood and look at his killer.

It was a woman. She has a beautiful blue eyes. The woman then whispered to her, "Sorry...Z"

Zero's eyes widened, only one woman calls him Z and it was his first love. He still didn't confess to her because he doesn't have any strength to confess. He remembered her Sangria red hair, it smells like roses. He also remember her beautiful oceanic blue eyes. Zero loved her a lot.

Zero started to questioned himself, 'Why did she do that? Is this what if feels to be betrayed?', he thought as he gripped on the girl he loves' shoulder. Zero asked, "W-why?"

"I-I didn't betrayed you...I want you to come with me... I love you a lot but I know this is a foolish thing to do but I want to saved you. You meet the old man, right?", she asked

Zero's eyes widened again, 'How did she know that?'

Zero didn't answer and look at her eyes.

"I see...you already meet him then let meet in another world.", she said as she turned Zero. When she did that the sword's tip is now on her chest, she pulled the sword towards her as she also coughed blood. She remove her assassin' cover and look at Zero. She smile weakly, "I-I will always loved you...this is the only way. I loved you."

When Zero saw this he started to tear up and coughed a lot of blood, "I will always loved you too, A..." he said as he hugged her tightly and closed his eyes.

When the other assassins saw this, they started crying.

"This is so heart-warming, guys *sniffs*" Assassin 1

"Yeah...*sniffs* we should always remember, A" Assassin 2

"We will miss you A..." Assassin 6

"Yeah...we will miss Aria.", they said in unison as they started to wiped their tears.

"Actually, they suit each other. Their nickname is A and Z...the first and the last letter. Are they destined to each other?", Assassin 4 asked

"Now that I think about it... that's right.", Assassin 7

"Hey guys! Let's eat, ramen!", Assassin 3

"That would be good.", Assassin 2

"Let's go!", they shouted as they leave the villa. The two of them was now on the ground hugging each other and already dead.

The black book glows brightly as their body vanished.

[ Underworld ]

A black hair boy lying on his bed. He has a pale face and lips as if he was sick. Beside him was a beautiful black haired woman with green eyes, she was worried about his son so she always stay at his side. The lady mumbled and said, "Please wake up, Zero...."

Suddenly, Zero's fingers moved slightly as he slowly opened his eyes. He has an oceanic blue piercing eyes like a dragon. The Zero who was lying on the bed wasn't the original Zero, anymore. Zero the hacker transmigrate in this child's body. Zero look at the beautiful woman who was looking at him with a crying face. He doesn't know who the hell is this woman but he felt the connection between them.

Zero asked, "Who are you? Who am I?"