Slave's Sword ~The Free City~

A flourishing civilization had sunk into the sea.
The night never dawns...... and a sense of apocalypse hangs over the world.
However, people who live in this world are not pessimistic.
They are living their lives vividly, exploring ruins to earn a living and doing their respective jobs, and their days are somewhat idyllic.
You'll land on an island in such a world, and as you explore the town and ruins, you'll come into contact with fragments of the world's mysteries.

Shuttered once and for all, or so it was thought, the Dark Gate has been opened once again by Coledohra the devil-god. A flood of monsters gush forth from another realm…

Erina, an engineer and a self-proclaimed adventurer, finds herself in Era Sheila after wandering from place to place fulfilling requests in pursuance of the romantic adventuring dream. The city is named after a famous adventurer, who happens to be one of Erina’s aspirations as an adventurer herself. Little did she know, the city had another moniker, widely known as the City of Machines. Just what does this city, one full of sex-starved men, have in store for Erina?

Iris Chromel, a saint of the church, became a vampire in the battle with the True Ancestor. Now that she has become a demon, she is in danger of being banished from her throne as a saint. One day, she hears that beneath the labyrinth city there is a holy relic that can completely seal away the powers of vampires, so she heads to the labyrinth city… Will she be able to overcome the dungeon and return to being human?

A fairy who accidentally wandered into the Underground Demon City.
To return home, she desperately fights to survive within the Underground Demon City.
In this world, women are treated as lowly “females.”
Can the fairy, Kazuko, escape safely…?