A Powerfull Assassin On Parallel World Become Demon Lord?!

"What should I do"

[Suggestions: Even Master using all energy of Nano-suit, this light will destroy your body. I don't know how it works, but this is very dangerous]

"Just use the strongest Nano-Shield!!!"

[But...]

"It's better than nothing!! I want to live no matter what happens.Just.Do.It!!!"

[Create Nano-Doom]

[Progress 95%]

Nano-Doom is the strongest shield that even can withstand 100 Tsar-Bomba, but the activation is quite longer than normal Nano-Shield.

But before Nano-Doom complete, the light already reaching him. At the moment he would have before the light struck, Ryuga changes his Nano-Swords and create a protective layer of Nano-Particles. But his Nano-particles vanish without a trace.

'This is useless'

Is this how I die?

I want to survive and return to Japan...

Kosaki...

....

....

....

The light swallowed everything and the forest now become a vast wasteland with a Giant crater from the light of destruction. The light grew fainter and eventually, It faded entirely, vanishing without a trace, leaving not a speck behind.

As the light faded, there is a single boy still standing without any injury. But even his body is unharmed, his Nano-suit were in almost destroyed.

Nano-suit on his arm was gone, his helmet also broken leaving his face exposed. Nano-suit on his body also slowly loses its strength. Only the feet' part was completely unscathed.

"Haaaahhh...Yessssss!!!!! I survive!!!!!!!"

[In the last minute, I found an abnormal phenomenon that makes your body Invincible against the light]

[Without that, Master would die]

"I see...But let's think that after I kill that Dragon first!! How much is Nano-Energy left?"

[Nano-Energy: 15%]

"We still have plenty huh..."

[That because I cancel the Nano-Doom since Master is unharmed]

"Thank you."

[I exist to protect you]

"Okay, listen to my command. Use all power to create powerful Laser to blast the dragon."

[Receiving Command]

[Acc.u.mulating Nano Energy]

[Star-chaser Laser is ready to use]

"Time to revenge."

Arcadia was shocked when he knows that Ryuga is survived from his attack.No matter how strong his enemy after struck by Heaven Judgement, they will vanish entirely and yet this boy can survive without any injury. Arcadia's attack was only able to destroy his armor.

Just how strong was his Armor?

That boy begins to gathering his power once again to attack Arcadia. This is the last attack because both of them already worn out. Arcadia can't summon magic anymore, so he only relies on his Dragon's breath. Arcadia squeezes his last mana to create powerful Dragon Breath to blast Ryuga. The Breath changes its color into Aurora as a symbol that Arcadia mixing five elements.

This was the first time, Arcadia forced into this miserable state. He was known as one of the strongest Dragon in Laverio. Not to mention, his opponent was a human.

Ryuga ready to launch his attack but he decided to wait Arcadia moving first. Arcadia chooses to attack Ryuga first and opening his jaw to unleashed aurora Dragon breath.

[Threat 70%]

[The destruction power was higher than before because some elements mixing together]

"Use Nano-Shield and absorb his attack to enhance our laser."

If the threat under 75%, his Nano-shield able to block any attack. Of course, that will cost more Nano-Energy but Ryuga won't let his last attack end in vain. If he forced his laser to meet with the dragon breath, their situations will be a stalemate. The dragon was exhausted and Ryuga can't kill him because no Energy left.

The Nano-Shield protects Ryuga perfectly but he feels intense heats through his skin. His Nano-suit was broken and exposed his body so his body will receive the effect of Dragon's breath.

"Aaaaaaaahhhhh...!!!"

The dragon breath is very strong and its a continuous attack. This was a battle of endurance between Dragon and Cyborg.

[Alert: Master, your body can't tolerate this attack anymore.]

[Solution: Using your star-chaser laser to eliminate the Dragon]

Even Ryuga tried to run away, his speed is much slower because his suit was severely damaged. His body was weaker too and he won't able to run for a long time.

"No, I will endure this attack. I won't let him escape!!!"

After enduring the fierce attack from Dragon's breath for 2 minutes, finally, Arcadia lost his power. He can't move his giant body anymore.

On the other hand, Ryuga still hiding his trump card and begin to use power from Arcadia's breath to enhance his Star-chaser laser.

"Goodbye..."

Ryuga thrusting his right palm to release a powerful laser to kill Arcadia. Star-chaser laser is one of his trump cards. The power of this laser is faster than light speed and like its name, it capable to destroy a moon in one shot. He also can use this to destroy a planet but that needs a lot of Energy. As Ryuga explore the Nano-Suit power, he found that he need 1000% Energy to destroy a planet like Earth. That wasn't because he plans to destroy a planet on a whim, but he needs to consider what to do IF someday a planet collided with Earth. In other words, his research as the countermeasures.

The concentrated laser hit Arcadia directly. He feels intense pains and severe heats from the "Light". Ryuga increased the size of Laser just to match with Arcadia's body.

"Graaaaaaaaahhhhhhhhhh!!! Kwaaaaahhhh!!!"

Arcadia was crying in agony, his scales were cracked everywhere and his flesh was burnt.No single speck of Dignity if the Dragon remains from him.

His head dropped over and he just laying on the ground without able to move anymore. The blood dripped from his body and his mouth. His eyes were burning with hatred.

Ryuga approaching Arcadia with extra wariness. He will kill Arcadia without any hesitation because he attacks Ryuga and makes him almost died.

*Step* *Step* *Step*

Ryuga arrived in front of Arcadia. His eyes were a glaring dagger at Arcadia. He begins to materialize the Nano-Sword to kill Arcadia by stabbing his head. But strangely the Nano-Sword never appears.

'What happens?'

He asking his AI via telepathy because he doesn't want Arcadia to know his weakness.

[Nano-Energy: 5%]

[Entering survival mode]

[Master can't use weapon function]

[Master only can use Stealth, Flying and simple function]

What a shame...

The energy is insufficient to make Nano-Swords.

What should he do?

"Hahaha to think I will lose to mere human...After you forcefully summon me here, you bastard!!!

"Eh..."

Ryuga stopped thinking for a moment because of Arcadia's word. Ryuga forcefully summon him?

Somehow, he remembers being summoned by Alicia yesterday and his action is nothing different like her. He feels guilty to Arcadia because of his foolishness.

Arcadia was attacking him because he was angry at him. His action similar when Ryuga mad at Alicia. He can feel Arcadia's feelings and decided to forgive him.

This battle is nothing more than Ryuga's fault. Arcadia was the victim and Ryuga can't kill him. Even so, Arcadia wasn't holding back when he uses the deadly light to kill Ryuga.

"Sorry for my foolishness...I just want to test my gift and I want to see a Dragon. I never intended to fight you when I summoning you."

Ryuga bowing his head sincerely because he knows that he was wrong. He doesn't want to become like Alicia. Become arrogant without thinking about the effect of his actions.

Arcadia doesn't speak anymore and closes his eyes. Ryuga knows that he doesn't die yet, maybe he just exhausted the same as him.

"I will take my leave. Tomorrow I will come here and you free to do anything to me, as long as you don't ask me to gives my life."

Ryuga leaving the scene by flying to the sky. He heading to Gobstar's castle but the castle was disappeared when Arcadia using his trump card. His territory was replaced by a wasteland without any plants.A living Hell in Laverio.

"Damn, I am so stupid..."

Ryuga flying back to the city where he meets the Heroes just to find a place to stay. He doesn't have money, but he can sneak into an estate with [Stealth] and become freeloader just for one day.

The battle with Arcadia begins from morning until evening. His body was exhausted and he didn't want to think anything for now. His priorities were to find a place to sleep and food.

He reaching the town at midnight and he chooses the biggest estate as his target. He using [Stealth] to pass the guards and enter from the balcony.

The estate is a three-story building and Ryuga chooses the third floor. He easily opens the Balcony and enters the room.

Inside the room, there is a luxurious bed with canopy and many facilities like a dressing table, wardrobe, full-body mirror.

Ryuga comes closer to the door and places his ear. He doesn't listen to any noise from behind the door, so he can open the door now. Ryuga leaves the room and searching the Kitchen. He still human and he needs to eat for his body.

After roaming the estate for 10 minutes, he found the kitchen. He rummaging the cabinets and find three pieces of bread.

"This is better than nothing..."

He eats the loaves of bread and comes back to previous rooms. He throws his body in the bed and closes his eyes. He needs to use [Stealth] until tomorrow. He doesn't want the servants found him here when he still sleeping.

His suits can't be recovered without Sun, so he needs to charge his suits. He will come back to Arcadia tomorrow to fulfill his promise. His remnants of Nano-suits also still in that place, so he will retrieve that tomorrow.

But who was saving him before?

No matter how much he thinks, he never finds the answer. Give up on his exhaustion, Ryuga decide to sleep. Ryuga doesn't know that the estate was belonged to the Ryuji's Party.

Let's rewind the time a bit.

There's someone watching Ryuga from far away. She was Divine being known as Goddess. Her name is Alice. She always spent her time to monitor Ryuga even when he sleeping.

"You are cute when you sleeping Ryuga.", Alice saying that while her eyes glued into Divine Mirror.

She wants to know everything about Ryuga, lived with Ryuga, stay by his side and support him every time. She wants to give her Divine Blessing to him, but she can't meddle into the Mortal Realm directly because she will get Divine Punishment.

All Gods and Goddesses were made an agreement that they won't involve in Mortal Realms directly. They only watching from Divine Realms and "meet" with Mortal being in the dream or when they are on the Church.

But today was different, Ryuga summoning a Pureblood Dragon Ancestor. She knows that Ryuga just wants to test his Gift, but this Dragon is very dangerous.

Pureblood means that the Dragon was from the Royal Family of Dragon Bloodline. Their body was stronger than a normal dragon with a vast amount of mana.

Dragon Ancestor means that the Dragon was living for a longer time and his strength was beyond the Demon Lord. Ryuga only level 15 and the dragon probably over Level 500. Arcadia's strength was on different dimensions.

At first Ryuga able to dodge the attack from Arcadia. He never took any damage from Magic because his suits were able to support him. Without that suits, Ryuga won't able to survive ten seconds after meeting with Arcadia.

Ryuga begins his counter attack and its effective against Arcadia's armor. The Golden Armor was destroyed and the real form of Arcadia appears. But even using miasma, Arcadia's attack never reached Ryuga.

That time, Arcadia sealing the battlefield with Barriers to prevent Ryuga to escape.He using his Divine Beast Authority to activate Heaven Judgement. That attack will kill anything regardless of their race, power, gender. The true power of destruction.

Alice immediately using her Divine Blessing to protect Ryuga from Heaven Judgement but managed to protect his body only. His suit was damaged and beyond repair.

Thanks to that, Alice was receiving Divine Punishment and her body feeling pain as she was stabbed countless times by Sword. Even she was a Goddess but she still able to feel pain and she endured the pain for a whole day. Her body feels burnt too, but she accepts this Punishment for the sake of Ryuga.

"I will accept anything as long as you safe, Ryuga. This was how I repay my debt to you."

She was gazing her beloved boy's face when he sleeping through Divine Mirror. By doing this, she was able to forget the pains that assault her body. Of course, Ryuga would never know anything about this...