So uh, I wanted to make a crossover between Danmachi and Tensura because I thought it would be interesting.

This is basically the draft

Btw this is my first fanfic so tell me what I did wrong and what I should improve.

Enjoy

Chapter 0

Rimuru POV

It's been a few months since I defeated yuuki and the world is peaceful but I'm bored and tired, there's been nothing to do except for working and making sure veldora doesn't do something stupid.

I wanted to do something new and interesting, like going on an adventure, but there was no such thing in this world. The most interesting thing that would happen to me is getting a visit from the other demon lords.

Master, if you want I can locate a new world and we can go there

Really?

Yes

Then ciel, can you find an interesting world that isn't too far away from this one. And while you do that I'll choose two people to come along

Ok got it

5 minutes later

"So, I have some good news to tell you we'll be exploring a new world together" I said to the two people present.

"Kuhahahahahaha it's about time we expand our rule over to the other worlds" raored veldora. It seems that veldora was also bored and wanted something else to do.

"Thank you rimuru-sama for choosing me to come along in this trip" said diablo with a blissful expression, acting like him being chosen was one of the greatest things to have happened to him.

"Well anyway, the plan is that we'll explore the world and learn as much about it as possible" I then glared at velodra and said in a stern voice "We will not be taking over that world" veldora then quickly nodded.

And now all that is left is to make an announcement to the people and then leave to the new world.

1 hour later

The people were really against the idea of me going away especially shion but I somehow managed to convince them. I got everything sorted out and was ready to go.

Should I open the portal, Master?

Yes open the portal, ciel.

Right away, Master

I then turned around and said to the two people next me "Rein in your aura and then go in the portal" after I said that they both reined in their aura with relative ease and then jumped in and then I said my goodbyes again, put on my mask and jumped in after them.

First thing I saw was a massive tower that seemed to go on infinitely, I also saw a wall that surrounded a city I presume and it was around noon.

"Rimuru let's enter the city and see what this place is all about" said veldora who seemed to be very excited about this. Diablo stayed silent and waited for my decision.

I nodded in agreement and began moving toward the walls and when I reached the walls a guard asked "What business do you have in orario?" he asked.

So this place is called orario, I answered the guard "We're travelers and came here to explore the city" the guard look at us the nodded and said "The entry fee is thirty thousand valis"

I'm assuming that valis is the currency here bur the problem is that we don't have any valis and I doubt I can talk him into letting us without threating him so I do the only logical thing which is steal. I moved faster than he could react and took the money bag that he had and then handed it to him.

The guard look confused for a second and then took the bag and checked the contents and let us inside. Sorry mister guard I'll repay at some point.

When we entered oario, veldora started looking around trying to find something interesting while diablo looked around unimpressed with the place.

I thought for a bit and then turned around to face them and said "We should each split up and explore the area and then we'll meet at night and remember to hide your true strength from the people here".

"Kuahahahaha then I shall go around and explore to my heart's content" said veldora as he walked off.

"Certainly rimuru-sama, I will explore and try and collect as much information as possible" said diablo with a bit of a sad face and then he turned around and started walking off.

That left only me, so I started walking off and examining orario until I realized, I didn't think of how we'll meet, uuuuhh I'll deal with that later.

2 hours later

I was sitting on a bench in a secluded area when I said "You can come out now there is no one here" out of nowhere came a person with a long black robe that covered his entire body, honestly it was kind of creepy.

This person appears to be a skeleton.

How could you tell?

Because I'm smart

What, ciel are you saying that I'm dumb?

No, I would never

Well whatever.

"Who are you and what does a skeleton want with me" I asked with an icy tone. He paused for a bit seemingly surprised at the fact that I knew he was a skeleton but after a bit he replied.

"My name is fels and I am acting as ouranos messenger. You have been summoned by ouranos and so have your companions" fels said then he turned around and started walking off. I pondered for a bit and then decided to follow him.

If I remember correctly, ouranos is the head of the guild right, ciel.

Yes, and he is the most important person in orario currently

In other words, if I want to stay here with no problems then I need to make a good impression, I hope veldora and diablo didn't do anything stupid.

5 minutes later

We reached a wide chamber with a seat up top and an old person was sitting on it, he had white hair and skim, he also wore a cloak and I also saw that fels was next to ouranos. I spotted veldora and diablo, they also noticed me and started walking towards me.

"Rimuru-sama, it seems that we all have been summoned here?" said diablo with a bow.

"Kuhahahaha rimuru this world is really similar to the worlds that are in the Holy texts (Manga) isn't it? Kuhahahahaha" roared veldora, he seemed to be really enjoying himself and was very carefree.

"Hey veldora, did you collect any information like I asked" veldora stopped, looked away and said "Of course I did" I glared at him for a bit and then sighed and walked towards ouranos.

Ouranos who was silent for the most part, looked down to me and began speaking "I am the god ouranos, the head of the guild and the one that summoned you. Now introduce yourselves" the guy seemed cold and distant.

"My name is rimuru tempest, a demon lord and also king of tempest" ouranos eye twitched at the mention of demon lord but was able to remain composed, then I pointed at diablo "This is diablo and he's my secretary and one of my most trusted companions" diablo smiled brightly as I introduced him, then I pointed at veldora "and this person here is veldora, my sworn friend" and veldora replied "I am the storm dragon veldora and sworn friend of rimuru"

"Demon lord rimuru, why did someone from veldanava world come to orario?" ouranos asked and I was a bit surprised that he knew I was from veldanavas world, I then replied "Because I was bored" ouranos looked at me skeptically and I said "It's the truth". Ouranos then replied with a look of disbelief "How am I supposed to believe that" and I replied "I mean, can you tell me the reason the gods came down here?" he thought for a moment and then said "Fair enough. Then demon lord rimuru what are you planning on doing in orario"

"I'm not sure I came here on impulse after all but I definitely want to explore and learn more about this place" I replied. Ouranos looked at me for a couple of seconds and then said "Want to make a deal with me?"

"Depends on the type of deal, Lord ouranos" it's probably a deal that entails something along the lines of don't do anything to orario or the people and you get this in return, which honestly doesn't sound too bad because I wasn't planning on doing anything to begin with.

"I want you to work with me and in return you get to stay in orario with no problems" stated ouranos. In other words, ouranos wants me to work under him so he can keep me in check and use if need be.

I unleashed my haki at full strength and looked ouranos in the eye "Do I look like some idiot to you, ouranos" ouranos looked frightened form the moment I unleashed my haki, so I then calmed down and retracted my haki. "Lord ouranos, sorry about that outburst but I can't approve of that deal." Ouranos looked a bit disappointed and I continued "But I can offer you a deal of my own. A favor for a favor that is the deal that I offer." Ouranous thought deeply about this deal and then asked "is there a limit to the favors" and I replied quickly "No". Ouranos then went into deep thought and seemed to have decided on his answer.

"I agree to that deal of yours" he said and so then I stated "Then I have a favor to ask of you, will you set up a meeting between me and loki familia." Ouranos looked surprised but also seemed to realize why I wanted to meet them.

"I will arrange a meeting by tomorrow, Demon lord rimuru" said ouranos. "You can just call me rimuru and I'll call you ouranos" I commented, it felt weird to be called demon lord by him.

I started walking away when I got curious about something "Ouranos, how did you know I was from veldanavas world" and he answered "I didn't" it took me a moment to realize what that moment and I felt so stupid.

Seems like you overestimated him, master

It seems like I did, why didn't you warn me ciel?

Because this is an important lesson for master to become an even greater leader?

Whatever, let's just leave.

I made my way out with veldora and diablo behind me that were talking about something that I couldn't be bothered with and like that my first day in orario came to an end.