Seven Sins System - Chapter 439: Fragile

From the outside, Nana’s life seemed simple. She had everything she had ever wanted: a cute but rascally pair of twin brothers, a best friend, and her own restaurant. Nana couldn’t ask for anything more; she was happy and content in her life.

It all happened so abruptly. After finally grasping my situation, I found myself in an entirely different world. Looking around, I noticed others in the same predicament… Could this possibly be one of those Hero developments?

Was there a tyrannical Demon Lord needing extermination, or would I be tossed into the maelstrom of war? Whatever it was, I was afraid. I never wanted to be a Hero. I don’t want to harm another…… Ignore the nonsense I was spouting; there was nothing to fret over.

The Demon Lord was slain a thousand years ago, and 800 years had passed since the last war. The nobles didn’t treat us summoned like tr*sh; instead, we were kindly cared for. The Demons have been on good terms with Humans for some time now. Dangers, such as monsters, were being taken care of by the Guild and the Order of Knights. What’s more surprising is the fact that I wasn’t even a hero! Instead, I was unintentionally summoned!

It also turns out that this world was a world in which the three races, the Spirit World’s Magical Races, the Celestial World’s Divine Races, and the Mortal World’s Human Races, are kind neighbors. Here, everyone lives a peaceful and fulfilling life.

In summary, this other world was――at peace.

What’s my plan for the future? For my limited stay here, I will live this world to its fullest; going on a cultural exchange, sightseeing, then, after experiencing the festival that is only held once every ten years, …… I shall safely return home.

However, despite my lust for a peaceful last year before returning, this planet’s heavyweights have begun amassing around me, and……

Transcend to become the prince of Daxia, activate the Devil Emperor Summoning System, summon the powerhouses from other worlds, and fight for hegemony in the heavens!

If I were the Devil Emperor in the future, I would definitely let your blood stain the sky!

- Description from novelbuddy

In a modern world where cultivators need a place to cultivate or vent their boredom, there are private businesses that set up instance dungeons with the aid of technology and cultivation magic to enable cultivators to train and commoners to experience the life of cultivation. They are called dungeon suppliers.
Xie Jin's one and only dream was to be a dungeon supplier and when his only relative passed away, the relative's inheritance gave him a plot of land and surprisingly, a 'System' Module which the relative had previously used.
With the help of the system, Xie Jin decided to pursue his dream of becoming the number one dungeon supplier.