Mainland

The first step is Self Realization.

Self realization about what your anger has done. What it is capable of. For those who accept their anger. The door to the heavenly demon closes on them.

Scientifically a very strong stimulus has to be applied such that the flow of anger is disrupted.

The asura in the mainland had accepted anger as a part of their nature. And closed the road on themselves.

While those who challenged their rage were able to move forward.

They had to suppress their anger. Which was a challenge on itself. Once they had learned to suppress their anger. Then the world starts opening to them.

The source of their anger is closely tied to the secrets of the demons.

They start to see the things that they couldn't before. And comes a special power of creation which is welded by humans as well as God's themselves.

The power of magic. But moreover tremendous amount of mana strorage. And a vast mana control.

But it does not mean that their rage ends. But instead it is suppressed and some of the anger is degraded.

Thus this is the time where one truly walks on the path of the heavenly demon.

The sisters Jal and Tsuchi when they were hit with the dread and fear of the slaughter so much that it hit a wave or an stimulus of self realization within them.

Which lead to a fear over their anger which they tried to suppress with all of their might.

As they feared that one day. They might see their parents and others in the same way as they see the villagers who were innocent. The ones who weren't at fault got slaughtered.

Thus they kept their anger suppressed. And one day they couldnt feel any anger. It's seems their anger had faded away and they saw the world for what it truly was.

All the others started to take their anger out on them as they were jealous while being angry of the fact that they have gained something that the others don't even when they tried preaching peach to their parents. In his anger the father grabbed one of the twins by the neck and the mother in her anger as well as her protective instinct ended up killing the father.

That's right they had seen what the world held for themselves. One day As the left their house for errands to gather some fruits that wildly grew in the forests north of the village. since now they could go anytime they wanted without tearing everyone down with anger.

When they returned every Asura had been killed. The entire village had been slaughtered but in a much more humane way. A deed which was implicative of human beings.

Demon hunters smoked out the hideout of the Asura and quickly ended their lives.

As a revenge for the slaughtering of the village.

They are still seeing what the world has done for them since they have opened their eyes.

But they have no choice but to flee to safety.

Before the hunters could notice their existence they ran through the north and had an encounter.

They were lucky enough to encounter Ikaros who just met them by chance. And got endoctrinated to a trip with a lot of Asuras to the Demon Island.

Where they spent years as the learned about respect and admiration all had for Ikaros even though he was a human. But he was strong so much that he was seen as the pinnacle of strength for both Humans and Demons.

At that time the Demon Island was Independent and was ruled by the Demon King or the Demon God.

The Demon God wanted to increase the number of Heavenly demons and Heavenly Asuras.

The Demon God was a kind soul which believed in the best for the Demon kind and was working with the foundation as they both had the same interest.

At first the contact with foundation was limited but bit by bit they started to intrude into the Demon territory which was undisturbed for years even more.

Eventually there was a point that it was not uncommon to see many humans on the island.

The foundation came and changed the island of demons in a bright way unlike the British.

And now there are three versions of the same story which leads to Ikaros leading the Demon army.

Version 1 :

The Demon God full of vigor and might challenged the immortals. From which one responded to the pleas.

The Demon God ledgered all of his power and control over the demon army.

Both the forces clashed from which One immortal came out on top. And then he began to lead the demon army as per the spoils of their battle.

Version 2 :

After the foundation had completely ingrained in the Demon Island. One of the immortals out of nowhere enters the kings castle and killed him in front of everyone and proclaimed the rule of the demons to be in his hands.

He forcefully took the power from the demons. And proclaimed himself as the king of demons.

Version 3 :

Once during a fight against the gods the demon god and the immortal both fought with the gods together but the demon god suffered a fatal blow and perished but before he could die.

He made the immortal who was with him take a vow to care of the demons and to treat them humanely.

The truth is hidden within one of them. The truth can be both be hideous or glorious.

And now Ikaros had taken entire control of the island. And under his thumb rule he waged war against his own kind.

A war to make the demons enter the mainland.

For it was once their home.

During this time Jal had Tsuchi had been training under mages with various elements but these were the ones who fit them the most. And thus they took their own name and changed it to the element most suitable for them.

Years later the joined the Demon army and were deployed directly under Ikaros himself second to none.

They were asked to keep building their strength like an explosive that will burst at the right moment when needed.

Jal and Tsuchi trained and meditated with the other heavenly demons in combat, mediation as well as magic.

Jal had developed a brother and sister like bond.

Because Jal like the aspect of Agni where he held everyone whether one was weak or strong, human or demon as equal.

Agni would be informal even with the Demon king and the Immortal himself. From which Ikaros seemed to enjoy while the others had much lukewarm reaction.

While metal was the one who never spoke much thus it was hard to connect with him. For both of them. While Raijin was a battle maniac. He boasted his power of thunder everywhere.

To his allies and also to his enemies. He was too proud of his power.

The unit was told to increase their powers for the optimal moment. And when the battle horn was sounded they themselves

For the time was at hand

And eventually the day arrived when the war began at first they weren't deployed but the situation changed when the Goddess descended all of the Demon kind who can fight was now deployed.

And some men with weird names were making waves by wiping out entire battalion within a single day.

Thus Ikaros gave the order of elimination and now they met face to face with each other.

It was either them or us.