A story of the past and.... what?!

"And… that successor is you yourself."

God pointed at him with his index finger before asking a question of his own.

"Why ask when you already know the answer?"

"Well you see, being able to piece things together and understanding is one thing… whereas believing is another."

Zero deadpanned at the god. How was a mere mortal like him supposed to believe the unbelievable?

"I see."

The Dimension God went silent and just continued to stare at his successor after giving two words to indicate his understanding.

This silence didn't really last that long though because unlike the god, Zero still had a ton of things he didn't quite understand.

Although it was pretty cool knowing that he had basically become an apprentice dimension god, he needed to know why. Why was the Dimension God choosing a successor? And why was he the one chosen? What was it that was so special about himself to attract the attention of this godly being?

"Um, Dimension God sir, can I please ask you a few questions?"

The raven-haired teen spoke with courtesy to which the figure being questioned simply nodded to indicate he could.

"The first question, why exactly are you choosing a successor?"

And as soon as he asked that question, the expression on God's face became dark which obviously startled our protagonist, thinking that he had asked something wrong.

But his fears quickly turned into curiosity as he noticed the middle-aged looking man only giving a heavy sigh with grief present in his eyes.

The question had obviously hit a sore spot and triggered bad memories for the god, but Zero was still interested as to what had happened to be able to cause a being like the one in front of him such sorrow.

The teen could practically feel the feelings of anguish coming from the Dimension God wash over him and boy was it not a good feeling.

Fortunately for Zero, it had only lasted a short moment before he felt the surrounding atmosphere return back to normal before God opened his mouth to speak.

"It's… a long story actually, but since you asked, this god will kindly tell you. You have the right to know as my successor."

With another dejected sigh, the middle-aged looking god opened his mouth once more.

"Before I get to the main reason though, let me tell you my- no... 'our' journey as we reached the peak of this multidimensional world and created our own dimensions."

"Our?"

Zero blinked.

"Yes, my dear sister and I."

And so the Dimension God started telling his story.

Apparently, the Dimension God was someone who was born from an entirely different dimension along with his twin sister.

Their parents had passed away when they were at a young age to which they were then taken in by a kind old man who had apparently found them sleeping on the streets. The old man proceeded to treat them as his own grandchildren while at the same time they also saw him as their grandfather figure.

The world in which they lived was one of the most common cruel worlds where everyone placed emphasis on the phrase 'survival of the fittest'. Fighting was present everywhere as all sorts of different races fought over land in order to expand their own domain. This included beasts and monsters who ruled over the forests, mountains, and seas.

So from a young age the twins began training, mainly to protect themselves and most importantly each other. After all, at the end of the day, they only had one another whom they can truly call family in that world, not including the kind old man of course.

The twins later found out that their adopted grandfather wasn't as ordinary as he seemed to be and was supposedly one of the strongest beings in that certain world. In this case, as both siblings started showing superior talent in martial arts, the kind old man started to seriously train them and while at it, also made them his disciples.

(A/N: A 'Dimension' contains many 'Worlds'.)

From their master, they had learnt how to properly survive in a cruel society where danger could possibly arrive at any time while further increasing their strength as much as possible in order to have more chances at living within the harsh environment of that world.

After graduating from their apprenticeship the twins ventured out into the world promising to come back when they become the strongest.

They hunted down many beasts and monsters and ended up being hunted down by others themselves whilst getting even more powerful in the process. They also made a lot of friends and were even betrayed by some of them.

It was essentially a dangerous adventure full of hardships.

After five years, the two had finally become the strongest beings of that world. Yes, five years was all it took. Their talent was just that great and combining that superior talent with lots of hard work and training, that's where they had ended up after a measly five years time.

Achieving the peak, the two siblings then decided to journey back home as promised, towards the secluded place where their grandfather and master lived in order to show off their results of training.

But what they saw after they arrived home became the biggest turning point in their life.

The kind old man they knew had passed away. All that was left in the small house, was a pitched black coffin laying next to a table which had a sealed letter placed atop of it.

The twins had been devastated.

The letter was obviously meant for them while the contents of the coffin were needless to say. Reading the letter left for them by their master, they came to know that he had always believed that they would reach the apex when he first saw their talent, along with the effort they had put into their training.

He also told the twins that although the time together may have been short, he had enjoyed his old life accompanying them and at that point, they were already bawling their eyes out.

Their grandfather figure also mentioned the fact that there was definitely a higher world out there to explore, something he was able to sense when he too had reached the peak of the world.

It was apparently one of his dreams to travel and experience a higher realm but he never had the chance to do so as he was just too old so he passed his dreams onto the twins, his grandchildren, and hoped they would be able to fulfill his wishes.

And that's exactly what they did.

After burying the coffin and making a grave for their grandfather at someplace secluded from everything, they began training again because no matter how they tried, the twins just weren't able to sense what their adopted grandfather had told them. Probably because they were still too weak, which wasn't exactly incorrect.

One year later, they finally were able to have a vague sense of the higher realms.

Then in the second year, the twins were able to break the space but unfortunately found out that their bodies weren't able to last long within the void, so they continued training.

It was only after another three years before their bodies could finally withstand the spacial pressure without any burdens, so once they had sent their farewells to all of their close friends and then proceeded to revisit their master one last time at his gravestone, the twins ventured into the unknown.

And unknown it was, as there was no real way for them to navigate in the void.

The only clue they had was in the direction where they had sensed the higher realm. The twins could sense that their next world was really was close to them yet at the same time far away as they drifted towards their destination. They did not even know how long it would take to get there as time and space seemed to run differently within the void.

Luckily though, both were strong enough to survive without food for a long time relying solely on their energy, or they would be doomed as the storage rings carrying all their food from their old world had shattered; not being able to handle the spacial pressure.

One day had passed, then one week and after that one month before the twins had finally reached their target - A new world and perhaps for them, a new beginning.

.

.

.

"... So from then on, it was just a repeat of what you experienced in the first world?"

Zero asked after the Dimension God finished recounting his story.

"Yes. Sparing the minor details of every danger that we had to face along the way, we were essentially just ascending towards the top of a world before moving onto the next. We sought breakthrough after breakthrough… all the way until we finally rose to a realm in which we acquired the power to create and alter a dimension that was able to accommodate countless different worlds."

God explained in return.

"I see… that's amazing and all but there's something I've been wondering about for a while now."

The raven-haired teen stated, rubbing his chin in thought.

"And what might that be, kid?"

The figure sitting opposite him raised an eyebrow, curious to what the boy was thinking. Although the god could just read the teen's mind, he was never someone who enjoyed prying into someone's thoughts unless he needed to.

"In those stories of yours, you kept mentioning that you had a twin sister and how you went on those adventures with her. So if you don't mind me asking, what ever happened to her?"

Zero asked with a very curious expression on his face, ignoring the fact that God had just called him a kid as the divine being had every right to call him that. He had a gut feeling that the sister of the Dimension God was someone who was very much related to why he was here in the first place and chosen as the successor of her brother.

The teen could practically see the painful and distorted expression on the god's face after he had finished asking and also the pale white fists which seemed to be clenched as if the deity was enduring something difficult.

Seeing this, even without his instincts telling him, Zero could very well put the pieces of the puzzle together.

From the expression of anguish this god displayed when the teen was asking why he was choosing a successor in the first place, to how much emphasis and care the god had placed when introducing his twin sibling, Zero thought that something definitely had occurred to her - and it wasn't anything good either.

Maybe she was extremely ill, that is if dimension gods could even get sick, and the god of dimension had decided to take care of her and couldn't focus on his job as a god of dimension… so he decided to find a successor?

The teen guessed as his thoughts turned erratically.

Maybe she was heavily injured?

Or even worse, perhaps she had already died and the Dimension God in grief, decided to retire as he felt tired. After all, who knows how long these gods had lived for.

But if the previous guess turned out to be correct, didn't that mean that even gods of their caliber could be killed?

Although he did not know much, or rather, anything at all about the levels of strength, but for someone who was basically on par with the god sitting in front of him, a being that was literally capable of creating large dimensions, to be killed, it was definitely something alarming.

Especially for Zero, as he was recently told to take over the mantle of the Dimensional God. That was why he was present here to begin with.

In fact, the teen's guess was actually not far off the mark.

But of course, there was always a twist when it came to these particular situations.

"My sister… was killed by my own hands."