He Who Vowed to Create a Demon Harem

Hello, this is Mia. When I woke up, I found myself trapped in a strange and terrifying place... I was surrounded by creepy monsters, unpleasant smells and strange sounds. But I have to get away from here. I have to be brave and take one step at a time.
 
...Will you help me?
 
Honestly, I don't know if you'll really answer my questions. But...there's this terrifying whisper in my head that I keep hearing. That whisper tells me that you will definitely help me. And Mia whispers to you some important information to help her along the way:
 
"It's your job to help Mia move forward.
 
But the road is very dangerous...many monsters are trying to attack her.
 
Even so, please don't give up.
 
With my help, Mia can see if the monsters have found her.
 
That information is projected directly onto her retina as a light like a line of sight.
 
I'm sure it will help you.
 
The fact that you've listened this far means that you're interested in helping Mia.
 
I'm going to tell you something very important...please listen carefully.
 
Mia will pass by...↓↓↓

A world where dragons have been hunted to extinction by humans.
The disciple of the master swordsman, Reiri, is still trapped in a nightmare from 15 years ago.
“A hometown turned to stone,” “A black dragon,” “A man playing the flute”…
Just as she had almost given up, thinking there was no way to find out the truth, she receives news that a “black dragon” has appeared.
Unable to stay here any longer, Reiri leaves her familiar home and sets out on a journey.
A journey to face fate, conspiracy, and herself…

One day, an island suddenly appeared in the sea about 100km east of the Kingdom of Greatland.
Some people land on the island, some by order of the country, some to investigate, and some just to check it out.
In the island, which quickly becomes crowded with people, one boy wakes up.
The boy, Riku, has lost his memory.
Wandering around without knowing anything, Riku meets
Sienna Clark, a nun apprentice, and Mira, a self-proclaimed archaeologist.
One of them is there to keep an eye on him, while the other is curious.
Thus, the party is complete, and they will explore the secrets of themselves and the island.
Will they resist or succumb to the difficulties that stand before them one after another?
The adventure begins, depending on their own choices!

Maybe I was destined to become a permanent employee of the King of Hell in this life, and then spend the rest of my life happily with beautiful women. However, I was transported to another world because I mistakenly touched a button.
When I arrived in this world, in front of my eyes were two women who were changing their clothes and stroking each other's bodies. Because of my arrival, their movements suddenly stopped ......
"Peeping Tom!" What kind of anticlimactic opening is this?
Future technology? Time travelers? The Mobile Unit? An amusement park on the verge of bankruptcy? What kind of nonsense is this?
Let's rebuild the amusement park with Keon, a genius girl, and Dee, a secretarial girls in professional attire!! Find a way to get back.
Wait a minute. Why am I working at an amusement park when I'm in another world?

After being falsely accused and ordered to drop out of school, you are forced to hide in a dark room and live your life. You thought your life could not get any worse, but you fell into a scam of online nude chatting and got caught in the middle of a fight between the gangs and the WSA.
You are not only arrested and imprisoned by the WSA, you are even sentenced to death. You have to either be the dog of a young lady or the hostage of a ruthless killer to have a chance of survival.
You will make your own choice between the daughter of the head of the WSA and the daughter of a gangster.
Modern technology versus the slums, the WSA versus the gangs, third-party mysterious forces, and strange alien creatures - all of these conflicts are shrouded in an impenetrable fog that will shatter your past life. Start over, solve all the mysteries, and become the hero of the city.