A Newbie Demon Lord and the Four Dispel Gems

Demons have been resurrected after a thousand years of sealing. There are over 10,000 of them.
The demons head for an island where beautiful mermaids live…
There lives a mother mermaid and her three daughters.
Mermaids are prey. Prey for the demons to indulge in their desires.
Mermaids are fish from the waist down.
Humans call them mermaids.
However, mermaids have a slit between their legs, and the organs that function as genitals remain.
They are well-built, with full breasts, curvaceous waists, and big butts.
It is their beauty that attracts the demons.
The demons thoroughly devour the slits of their private parts.
It doesn’t matter if they can’t spread their legs. Even though her crotch is closed, the devil forcefully rapes the mermaid!
The mermaid’s pussy, deep inside her closed crotch, is now opened for the first time!
The devil first attacks the mother… Then he attacks the fleeing daughters one by one.
The mermaids are unable to escape in the sea, which is protected by a barrier, and are quickly cornered…
The devil beats the daughter in front of her mother, who begs for help, and then finds her crack and hard-rapes her!!
The devil continues to thrust into her, even as she cries out “Mommy! Mommy!” Gangbang and creampie! Repeated egg-laying!!
The never-ending story of a mermaid whose screams echo throughout the island.

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In Free City, a famous red-light district full of brothels with a variety of races attracts both locals and foreigners.

Suddenly, due to the opening of a competing brothel that provides new and innovative sexual services, the old brothels find themselves nearly out of business. The new brothel is run by reincarnators and the red-light district must find a way to survive its competition.

The goal of the game is to unify all the brothels and manage a better business than the competing reincarnator's brothel with cheat-like otherworld knowledge.

Years after the defeat of the Demon Lord, Viola and her little brother Miro are living
peacefully in a remote village. But all of that is stolen one day when a demon appears
and demands the birth of a strong demon who will conquer the world once more.
And it's up to Viola to provide...

After reports emerge of the disappearance of the greatest Demon Slayer, Ayano Senjuin, a search party is formed to investigate her whereabouts. Eventually, even the search party goes missing. Having learned of this, Shion Rokujou, a top-class Demon Slayer, hastily sets out on her own in search of Ayano and the search party.
Will Shion be able to find Ayano and her comrades? Will she succumb to the same fate? And what kinds of foul creatures will Shion encounter in that extraordinary cave?
Dive into its depths and find out!
 
Battle your way through the various levels of this complex and supernatural cave while managing your intake of its poisonous fluids and fumes. If too much poison accumulates within you, travel back to the base and have the poison extractor detox you.
Along the way, you will find fellow Demon Slayers that have also gone missing in the cave. Release them to get various rewards, as well as Spirit Energy. Spirit Energy allows you to gain new abilities and techniques, and it also functions as a currency between Demon Slayers.
Your actions and choices in your journey will trigger different endings, so be careful!