Ian Percus, the second son of a countryside Viscountcy.
One day, he received a love letter from the future.
'If we don't protect the future, the world will perish.'
With an ominous warning scribbled by someone

In the Stone Axe Tribe, a band of young warriors, led by the spirited Urich, embarks on a hunt in the forbidden Sky Mountains. Unknowingly, they cross into an unseen civilization, revealing two distinct worlds divided by the mountains. Urich, a curious and charismatic barbarian, is enthralled by this new world of endless wonders. Join Urich as he explores unfamiliar lands and make thrilling discoveries, and unexpected alliances.

Starting from today, I am retired. But what should I be doing? I neither have the skills, nor the mind to do business, my only advantage is this pair of hands which have taken this world. What a headachea|
Note: The usage of the term aretireda here doesnat mean retiring from old age, work etc. Itas a specific term to refer to not involving oneself in the affairs of a certain society.

One day, I woke up only find out that Iad become a Demon Lord, an individual responsible for protecting a dungeon. The world Iad been spirited away to was one filled with violence. Gigantic monsters wandered through it and competed with each other each and every day for the right to survive. I had no choice but to strengthen my dungeonas defenses in hopes of living another dayaor at least that was what Iad thought. For some odd reason, I instead ended up spending my days in relaxation and bliss.
This is Yukias story, my story. It tells the tale of how I spent my days after settling down in a dungeon with a self indulgent, asupremea dragon girl and a young vampire.

I got sucked into a novel full of villainesses, and taming them is the only way to survive!

Raonas entire life had been lived as a dog on a leash.
Through a twist of fate, he obtained a new life.
Wrath remained in the wreckage of his destroyed leash.
Finally capable of standing on his own feet, he decided to live life by his own will.
He would slay anyone standing in his waya|
Even if they were a god.

Unrivaled Spear Knight. The stereotype that knights must use swords is broken by the brightest star of a dukeas family.
The hero that brought an end to the empireas civil war. The name of that person is Joshua Sanders.
Despite his reputation of being called the empireas unrivaled spear, he was bleeding dark red blood.
Not just anyone but by the hand of his own emperor, Kaisera| aKaiser! Donat think it will end like this!!a
Moments before death, incurred by magic circle, the spear that spent its years together with him, aLugiaa, started to emit an enormous amount of energya|
This familiar place, it canat bea| the stable that I used to live in when I was young? My body became young?!
Lugia, what the hell are you? Joshua returned to his younger self. His ultimate revenge starts here!

aCompared to our time, the current generation just arenat as reliablea they said, aStill, isnat he the son of the Hero?a How annoying.
Itas been over ten years since the battle between mankind and the demons ended. The children of the heroes who saved the world are all grown up.
One of them, Earth, was a talented man, and everyone expected him to succeed his father as a warrior and defend his country, but Earth was always wary of his fatheras title.
One day, Earth is shocked to find his fatheras sword, which was used to overthrow the Demon King, sealed in his familyas mansion.
Because trapped within was the ghost of the Great Demon King who was unable to pass on and continued to roam the world.
For some reason, only he could see the spirit of the Demon King, and the Demon King possessed him through the sword.
Every day, forced to coexist with the spirit of the Demon King, they live a strange shared life, when the Demon King whispers to Earth on a whim.
aI have a grudge against your father. If you want to get back at your father and the world, Iall train you. Iam free.a
Earth receives special personal guidance from the Demon King just to get back at his parents and the world.
Then, in the coming days. The heroas parents, the heroes of the past, the first love, the princess childhood friend, the geniuses of the era, and the world will tremble.

To save the hopeless Dark Fantasy World, I held back my tears and destroyed the world, then killed the Demon King and returned.
Now, Iam trying to save the world using the aSystema I gained as a aRegressoras Privilegeaa| But the Main Heroines have also awakened their own memories of the previous timeline.
God damn it.

The weak prince of an insignificant country, Davey. After becoming comatose, his soul escaped to a temple where the souls of heroes gathered.
He trained for a thousand years and has now returned as a max level hero!
aJust you guys wait, Iam gonna face you all head-on!a
The refreshing story of Daveyas royal life and revenge has just begun.