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A Powerfull Assassin on Parallel World become Demon Lord?!

Ryuga Kiyotaka is an ordinary boy that you can find anywhere. But he has a big secret that he hides from anyone. Ryuga works as Professional Hitman or Assassin. He doing that to continue Kiyotaka's Family tradition and to repay their kindness. He is an Orphan, but he has a lot of talents to make him recruited as an Assassin. He never failed to do his mission and have a 100% success ratio. On a certain day, he was teleported into a Parallel World after he finished his mission by a wicked Goddess to become Demon Lord!! This is story about the adventure of the Strongest Hitman with powerful gadgets to find a way to return on Earth.

Shameless_Author · Anime & Comics
Not enough ratings
27 Chs

Dungeon

After finishing the test, I use [Stealth] once again and leisurely walking to the deeper floor. Low-level monster won't notice us after all, rather than wasting my time killing small fry without much value, I rather go and find a worthy opponent.

If I get the item, I could sell it later after getting promoted to a higher rank. Wait, could I sell this item as Duelist?

Nah if the worst case comes, I can ask random adventurers to sell the item, and give them few rewards for helping me.

I meet with a lot of adventurers on each floor. The most common thing with them is they always come as a group. Mostly with 4 people, 2 as a front guard, 1 magician, 1 healer or scout maybe?

When they are in trouble, I sometimes give a hand like stabbing the monster from behind while using [Stealth], I don't get the material, but I got exp to raise my level.

I got the exp and they got the material, a win-win solution.

"Hey, I don't get exp for killing this monster!!

"What?!! Really?!! Ah goddamn, who steal our prey huh?!!

But some of them were angry because I steal their kill, so I ignored them.

I arrived on the 10th floor in a short time. Giant metal doors tightly shut, and I could sense something different from something behind this door. I approaching the door and it opened itself, revealing a spacious room with a single monster in the center.

Goblin with the size around 3 meters with something like a crown on his head. In his right hand, he carried a long iron sword and have a big round shield.

It somehow makes me remember Gobstar in the past.

He glanced at the door and seemed like he knows my position.[Stealth] could hide my body, but he could smell my body odor.

He charged with all his strength, I leaped to the side to dodge his attack. Arcadia watches my battle in the corner as she lost interest in go to the dungeon.

I tried my new skill [Teleportation] and ended up crashing in the wall. My body buried in the wall and I hardly move from my position.

[Master, you need to take little practice before using an unknown skill like that]

[If you don't have protection from Nanoparticles, you will be dying without giving a decent fight]

With some efforts, I could free myself from the wall and I immediately crouched because the Goblin King swing his sword to sever my neck. I rolled to the side and take some distance. This time I will teleport to the right place.

I imagine I standing in front of the Goblin King and I successfully appear in front of him, I thrust my fist to his abdomen. A casual punch makes him flying like a cannonball.

I used teleportation to deliver a series of attacks, but I couldn't master it in a short time. I sometimes miss the spot and the Goblin King would use his sword to attack me. Luckily he is still small fry for me so his attack won't make much damage to me. If I mess with dragon and only have half-assed skills, I would be beaten to death.

Fighting while imagining the skill is difficult, who said you can master the magic by just imagine?!

I spent 3 hours to beat the Goblin King. The result of my training, I could more or less grasp the effective method to use [Teleportation]. This skill isn't for fighting in the first place, so I need to do several practices to use it in the battle.

The first basic is to determine the location that you want to teleport. This is basic for this skill but when the battle in close range, I need more specific, so I used nearby items like pebble or stone as [checkpoint].

After getting teleported, you need to accustomed with the dizziness for a moment. I already master this step, thanks to the toughness of Nanoparticles.

I notice a fact too, despite using [Teleportation], I don't feel fatigued like my mana is reached the limit.

"I don't know if this was true or not, Demon Lord usually living in a dungeon you know. To them, Dungeon is similar to their home, so you will hardly feel tired even you are losing much Mana."

Arcadia tell me even without I asked her. Is she can read my mind?

"That because of the Master-Servant Contract."

"I see..."

"Don't worry, I won't do anything with that. Your mind is filled with your family, your sister and money right now." , She said that with a sigh after I staring at her.

"So basically, I could spam skill in the dungeon?"

"Spam? I don't know that, but you can use any skill with a lower cost of mana inside the dungeon because you are Demon Lord. I don't know the rule behind it, but in the past, I met with a Demon Lord in the Dungeon. He used many skills at once all day without losing much mana, though in the end I destroyed his dungeon and buried him alive."

"..."

She is crazy strong and she seems to confident with her strength. I want to tease her, but provoking her won't give me anything except trouble, so I leave it for now.

*stare*

"What? you read my mind huh?"

"Hmph, bring it on, if you dare!!!", she throwing tantrum.

I take the red monster's core from the Goblin King. Its located in his chest after I scanned his body with my right eye. Its size is about a tennis ball with a red color.

"Arcadia, do you have a magic to store items into dimensional space or something?"

According to the light novel, the Item box is a common ability for Hero, but I don't have that. Arcadia probably has a skill like that.

"Yes, I have [Storage Space], what do you want?"

"Please save this core for now. I don't have a convenient skill like you."

"So you want me to carry your luggage now? You begin to treat me as servant huh..."

"This is just a small request, are you implying that you would be troubled by taking this tiny ball?!"

"Okay...", she takes the monster's core and stores it in the [Storage Space]. The core was sucked into the darkness and vanish.

Before I could continue my journey to the next floor, my body was moved on its own and I end up carrying Arcadia on my back.

"Hey, what the meaning of this?"

"Human is always dreaming to ride a dragon isn't? But this time, a dragon riding a human!!! This is a perfect humiliation for humans...Hahahahaha!!!"

This position makes me harder to move, but at least it doesn't bother me too much. I carrying her while creating Sword from Nanoparticles and control it to attack the monster.

Arcadia enjoys the view on my back and she even doesn't care about her chest touching my back. The common sense between dragon and human here is too different.

Giving her a piggyback is a simple task for me, but as a dragon, she enjoys to crush my pride though I don't really affected by such an act.

We go deeper into the dungeon relatively easily. The monster instantly killed after their core destroyed. I have met some type of monster here from slime, goblin, bat-like monster, kobold, hound, orc and wolf.

The monster pattern is the same, but the monster on a deeper floor will wear decent clothes, showing a little intelligence and begin to teamwork. At the 20th floor, we met with a giant wolf with the ability to create an illusion. For normal people, the wolf will split into four but I easily see through the illusion with my right eyes.

Thermal sight, Heartbeat sensor, X-Ray, and many advanced technologies were installed into this lens. It was painful to have a powerful lens like this, and I used to take it off after the mission. Thanks to Alicia, I got this thing stuck at my eye forever (probably).

From the 21st floor, the enemy was using leather armor, and their skin has a different color with the normal monster. I knew this monster called subspecies.

They are stronger than normal monsters and sometimes could use magic. More monsters could detect my presence when I using [Stealth].

Luckily they are still able to be killed with one hit, so I don't find trouble in my journey. On the 26th floor, I found a large party with 30 people fighting against 5 pig-like monsters.

Its size surpassed two meters and I felt it could reach three meters. It has much difference with the orc in my knowledge. The two fangs jutting out from its lower jaw and the pig nose are the characteristic of the orc. But it also has body hair growing on its shoulder like fur. The color of its skin also feels different from what I see before. They all carrying a great sword.

4 people surrounding one orc, they stabbed their weapons to the orc, but their weapon couldn't pierce the skin of the orc.

"Back down, that thing are subspecies. We need a powerful magic to defeat them!!"

A single man who older than the rest of the party gives an order.

The orc faced the adventurers whose weapon we're broken and swung it's a great sword.

A single Horizontal swing, it was contained no skill, only brute force.

Thanks to the leader guy (?), the adventurers could escape without fatal injuries.

"All mage please prepare your magic!! Do it in the way that doesn't burn the surrounding."

"Got it"

I could see there are 4 mages holding their magic staff and begin chanting.

"The one who can fight, step forward and help me to buy time for mage!!! The rest, protect the mage!!!"

There are 16 people who fight with orcs, 4 mage and 10 people guarding the mage.

"Hmph, mere human struggling against pigs.How unsightly..."

Arcadia leaves a rude remark toward them.

"Stollas-san, We are ready!!!"

The mages who finished preparing their magic directed the staff's tip to the orcs. The leader gives an instruction to retreat for the front liner.

Stollas-san who reacted to the mages dodged the great sword that the orc swung randomly while rolling on the ground to take distance from between the orcs and the mages.

All mage chanted the name of their magic.

"Wind Cannon!"

The compressed wind is fired toward the orc. Speed, power...it was a quite powerful attack that possessed both.

When the magic collided, the wind blew wildly around with the orcs at the center. The orc stabbed its great sword on the ground and stood calmly. They has pushed back only a little...a distance that wasn't even a meter.

"Haha what with that [Wind Cannon], for me, it's just a weak breeze. Looks at that monster, they don't have injuries at all!!"

Arcadia keeps mocking the adventurers from my back.

"We are sorry, firing even stronger magic than that in this place is dangerous..."

"If we are couldn't pass this floor, we would never able to beat the record of the deepest exploration in this dungeon."

"We still lack strength huh..."

"Let's get back to the surface..."

The orcs didn't let their prey escape and begin chasing them. The adventurer runs toward the stair to the previous floor, and I saw a familiar face...

She is the silver rank duelist girl who saved a tiny man before, so she left for joining this party huh...

The orcs easily surpassed them and block their escape route. Two orcs stand in front of them and block the stairs while 3 orcs surround them from behind.

"Are you gonna just let them die here?"

Watching the brutal death of adventurers will leaving a very bad taste in my memory, so I would like to help them for now.

Even though I was raised with knowledge and training as an assassin, my new parents wish for me to have a normal life. My father once told me, "Don't let your heart grow cold and dull, even you are used to kill people, that because of your job. Like the death row executioner.

"I think I could lend them a hand for now."

Of course, I will keep myself hidden. I don't want to reveal my power too much.

Now, how I am gonna help them?