A Demon King Through The Worlds

Her hand slowly opened, revealing the coin: "It came up heads, I will join you."

Seeing this result, Kanao showed neither joy nor sadness, as if her decision was not the same as entering the lion's den.

As if something like that wasn't decisive and would end up greatly affecting your future life.

"That's good, Shinobu will introduce you to what you need to know and after that you can train under Kokushibo's teachings." Lucian smiled and began to tell Kanao what to do next.

After she nodded Lucian turned to leave, Shinobu quickly followed him to ask a question in a low voice:

"Did you cheat?"

"It's only cheating if someone sees it happen," he replied before leaving just her and Kanao in the room.

"…Pfff hahaha that's actually something he would say." Perhaps relieved after everything that had happened, with her revenge finally complete and with her little sister by her side, Shinobu began to laugh happily.

Probably the first time she had laughed so happily since his older sister died. In fact, it could have been even longer, perhaps years.

Douma was dead, her sister had been avenged… There was no longer any need to constantly worry about the threat of demons, especially since she was now one of them… And now Kanao had joined as well.

"Come on Kanao, I'll show you our new home."

...…..

Lucian also smiled happily, after all, his wives' joy is his joy.

As for the possibility of the coin landing on tails… it didn't exist and even if it "existed", it was impossible to let Kanao leave. That was never an option, especially considering that they were already in another world.

"The easiest way to ensure you don't get turned down is to not ask."

With that issue resolved, he simply went to another place within the Infinite Castle to meet with Akaza.

Both of them still had one thing to do – create a martial art that worked perfectly for demons.

"Even if it's not really possible, perfection is something very abstract…"

But it's not as far away as it may seem.

Human martial arts seek to avoid injury and fatigue, while causing the greatest possible damage by attacking the opponent at weak or strategic points.

Demonic martial arts could seek to cause a large amount of damage while ignoring injuries and fatigue, that is, completely forgoing defense and moderation.

Practically functioning in a diametrically opposite way, one seeking to remain whole, while the other can reach the point of self-mutilation to cause damage to the opponent.

Many demons already show complete indifference to whether or not they are injured, but this can be taken one step further.

"Akaza, are you ready?" Lucian asked, raising his fists and cracking his neck.

"I've waited too long." Akaza also raised his fists, eager to fight.

They were trying to create a new way of fighting, and what better way to do that than by constantly fighting, just as they had done in the previous days?

They exchanged punches and kicks with great intensity, taking no defensive or evasive action, using their regenerative powers unrestrainedly.

Ignoring the pain and fatigue, for they are demons and do not feel such things… with only a few rare exceptions.

Just as they intended, but that still wasn't enough, they were simply being like wild dogs affected by some disease.

They also intended to increase the benefits brought by the great regenerative capacity – to create abilities that are based on self-destruction, on exchanging parts of one's own body to multiply the damage caused.

Whether it was stretching, compressing, rotating, twisting or exploding. From the easy and common ones for demons to the complicated ones that have not been done by anyone so far.

'At least I don't remember and no demon that twisted its arms to attack… well, I guess I'll be the first.'

Then the muscles in his arm began to twist, compressing slightly, somewhat like a spring.

And with the punch he threw, all the force accumulated in this "spring" was released, as his muscle fibers twisted again, returning to their original state at high speed.

As a result of their actions, the fibers broke violently, also tearing the skin and fracturing the bones.

On the other side of this confrontation, Akaza's body was torn apart by the great force that ran through his body, increasing the internal pressure and causing him to explode.

This left only his legs, while the fabrics of his upper body were scattered across the floor and slowly turning into flying ash that soon disappeared.

Fortunately, as long as all the cells are not destroyed and/or the connection between the body and soul is not broken, the demons continue to regenerate.

In ancient times, sunlight or objects imbued with sunlight could sever this connection, effectively killing a demon. In weaker demons, a significant degree of physical damage could result in death, but in powerful demons, even a relatively small mass of cells was sufficient for regeneration. On the other hand, a sufficiently powerful toxin could prevent the cells from reproducing and kill them.

Of course, the use of supernatural powers is also capable of killing demons, just as Lucian is capable of disabling the regeneration of any demon.

The stronger a demon's strength, the stronger its soul. There is an inverse relationship – the stronger the soul, the fewer cells it needs to stay alive.

Therefore, this wound, which would be enough to kill weak demons, could be easily regenerated by Akaza.

The small cracks in Lucian's bones disappeared in the blink of an eye, soon after his muscle fibers grew and intertwined, reconstructing the muscle groups that had been destroyed.

In about a second, his arm was completely renewed, his skin as white and smooth as ever.

On the other hand, Akaza would still take a while longer, after all, ease is not speed.

'I should have attacked his lower body… he's unable to speak without a mouth.' Lucian sighed a little boredly as he sat on the ground and timed how long it would take Akaza to finish his regeneration.

"…"

From the legs a spinal column began to form, with scant muscles to keep the spine straight while a skull emerged.

Stem cells were released, filling the skull and differentiating to form a brain, and from it extended an optic nerve along with muscles, a red mass then became an eyeball, restoring Akaza's sight.

With the most complex part, the brain, already regenerated, followed by the other constituents of the head, the red liquid leaked through the holes in the skull, becoming muscles and skin. The hair soon grew, returning to the size it was previously.

After the highest priority was completed – the head regeneration – the other parts began to regenerate as well.

From the spinal column ribs began to grow, at the same time muscle fibers extended from his legs, attaching to the new ribs and gradually closing the rib cage and abdomen.

With the head and torso regenerated, it only took a few seconds for the arms to fully heal as well.

"You really hit it hard, I practically felt my body being evaporated," Akaza commented as he stretched and moved his body, as if he was trying to get comfortable with his recreated upper body.

"This proves that we are close to success, we have already managed to create a punch that sacrifices the arm in exchange for causing massive destruction, although there is still room for improvement in the conduction of the force." Lucian nodded, highlighting how effective those punches had been.

"Now we must create variations with greater dispersion or greater concentration. One to be an 'area' attack and one to be a penetrating attack."

And since they still had a lot of work to do, they continued fighting for a long time, fortunately, this was not a tedious work.