AbovetheDungeon:Frontier

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As a noble child with no inheritance rights, he is detected to have a talent for learning magic, and begins a life called learning, which is actually just an assembly line work. Late one night, a fairy girl breaks into your room, ties you up, and calls herself your master. Inform the family that you are seeking the status of a pioneer noble, and that you are required to travel to the territory immediately.
When we get to the territory, everything we see is ruins. You need to rebuild the land that has been ravaged by demons. (Demon: We came here like this, don't talk about it.) In the territory by chance (deliberate guidance) found a dungeon. You realize that this is going to be the backbone of the territory's future industry, but as you start exploring the dungeons, suddenly everything seems to have been designed.
"What, this dungeon is the ancestral property of my ancestors?"
"Ah, could he be down there waiting to take me?"
Although the flag is a little too much, this story is actually a happy story. All the characters will be fine, including the main character.
Territorial construction
You need a pillar industry around the dungeon to develop your territory, earn money, and attract outsiders. Simply put, city building, building your land, collecting taxes. After fulfilling the requirements of the Kings, you can promote your noble title, gain more territories, and perhaps eventually you can also rank among the Kings.
Dungeon exploration
If the territory is to be developed around the dungeon, then it is natural to ensure the safety of the adventurers who travel to the dungeon. You need to form an exploration team to explore the dungeon, find the magic node of the dungeon, and bring it under control. In the process of exploration, some experimental records or documents left by ancestors may be collected. Leave controlled dungeon areas open for free adventurers to explore, and a steady stream of monsters will provide plenty of wealth.
An adventurer: "Why are your tickets so expensive?"
cameo

The fairy girl whose origin and purpose are unknown, claims to be the master of the protagonist, and her character is too serious. Seems to know a lot of things, but for some reason can't tell the main character. There are anecdotal reports that he often acts as an enthusiast to help solve problems in his territory.

The Blue dragon girl, who decided to run away from home because of excessive addiction to the novel, was caught by a passing enthusiastic crowd when she tried to rob a "decadent" remote aristocrat. The first day of the legendary road was declared to be over, and after the guidance of the enthusiastic crowd, he deeply realized his own mistakes. Determined to do something to help the town that had been damaged by him.

Claiming to be a runaway from another world, he used artifacts and drove dangerously while using the spirit world to walk, causing him to crash into a certain plane's portal and get stuck in a portal in the territory of an unknown noble. After being pulled out by a passing enthusiast, he learned that he had committed a big crime and asked the enthusiast to give him a job that could hide his identity.