It was just like any other day in the demon world. Mystery less, but the feeling of being back in power.

Neuro remembered the first time that he has tasted a mystery.

Since it was very rare the demons of hell to have a thing called mother or father , the demons had to find themselves, a way to get strength, energy and food.

Also, ways to stay alive till the end.

Since Neuro was able to archive all these very easily, he become the top of the food chain.

but he himself have needed to learn what was the source of his energy at first. He was thrilled when he have found out that the mysteries gave him such satisfaction.

Neuro was very hungry again his stomach rumbled for mysteries. The last time he had a good taste of mystery was …… How long ago?

It wasn't the first time he have left the human world and returned to the demon world at the verge of death. It was very hard to defeat that criminal named Kasai from the blood line. This was his second time to return home. Neuro builded up his power up for a long time to become the most powerful one in hell once again.

Soon he lost track of time but thing like time didn't matter in Hell even though it did in the human world.

"Just one more breath…"

Huuuu hhhaaaaaa…..

Suddenly a green light appeared above him opening the sky of Hell.

"It has been 5years? Has that bastered returned yet?"

"No….but I'm sure he will return someday soon."

"I'm not an expert on this but hasn't it been too long?"

"I don't think he will make us wait too long"

"NO, I didn't mean by that. I was talking about that."

"Oh you mean that. Well… Ah, it moved."

Neuro was going though the dimension that was connected to the human world once again. "I wonder if the louse have evolved wile I was gone like the last time. If the time has passed too much in the human world I might need to find a new cover though. I still haven't found the ultimate mystery"

A bight light shined and surrounded him. Neuro closed his eyes for a minute it took a wile to get to get his eyes adjusted to the brightness of the human world. When he opened his eyes he saw something he never expected.

The buildings were nothing but ruins. Only few of them were standing tall, the air was foul and he was able to sense many evil intent and so many mysteries surrounding him. "Is this really the human world?"

I was very sure that I have opened the gate leading to the human world. So many evil and mysteries are here. I do not remember the human world like this. What has happened?"

Neuro looked around to find the detective agency.

All he saw was broken down buildings that were still managing to shade some parts of the city.

When he reached to the place a pile of rocks were covering the ground. It where the agency use to stand. Neuro got frustrated. He wanted to know how many years have passed and how what has happened wile he was gone.

Neuro went to the place where he first met his slave number1, her home.

Yako's house looked like a haunted house and nobody was home. Neuro was suddenly worried. He really might need to find a new slave again, he just hoped he could find it before he starve to death infront of this large 'buffet of mysteries'. He searched for Yako's sense this time. Then a familiar face appeared infront of him.

"O….oi you are back?"

Ah, it was his slave number 2

Godai rushed to Neuro and grabbed his collar

"What took you so long you monster?!"

His eyes were filled with rage and hatred.

"Ho… looks like wile I was gone you have not been trained well. Or have you forgotten your position?"

"I don't give a shit you say do you have any idea what has been happening wile you were enjoying yourself in Hell?!"

Godai did not move his hands and Neuro was surprised. Godai knew that he was not a normal person but he never did figure out who he actually was or from.

"Where did you get the idea? And where is that louse?"

Godai's eyes trembled at the word 'louse' and he let go of Neuro.

"Follow me."

They were in a hospital. Doctors were rushing everywhere, some of them looked hurt them selves and there were so many people injured.

Godai led Neuro to a room.

Room253.

There were so many machines and wires surrounding just one person who was in the center of the room. Yako.

Yako's condition looked terrible. Her body had deep cuts and there was a clear scar showing around her stomach. She looked so pale that Neuro actually thought she might be dead.

"Neuro.."

For people who did not understand the story so far

Kasai who was a dangerous criminal from the new blood line became Neuro's New enemy when he came back to the Human world.

Kasai, was is also known as the fire user was defeated by Neuro but gave him too much damage wich forced Neuro to go back to hell.

Neuro who went back to Hell came to the human world the third time.

It seems that the human world has changed alot wile he was gone the detective agency is destoried and Yako is terribly hurt.

Who did this? How long was he gone?

Yes I know its depressing and its not going to be soon.