Oceanides Of The World's End

Year 2055. Tokyo.
Wars, resource depletion, and population decline.
In this place filled with despair, the bright girls perform live streams. Being evaluated and ranked in this world, their eyes become increasingly clouded.
In this colorless, dark world, a girl awakens.

“HELLO WORLD! I am Ai from Vstar!”

The girl continues to sing until the world ends, shining in the despair.
 

A long time ago, in a galaxy far, far away there exists a Galactic Empire ruled by Emperor Paipatine the 6969th. The Empire has been warring with rebels for many years, and both sides desperately desire something to boost their spirits from the fighting... And that's where our hero steps in. Squid Inkwell, a tentacalien, is itching for his opportunity to conquer another planet to expand his species's joy-bringing enterprise, and that time has finally come.
 
Capture the people of Earth using your powers as a tentacalien, putting them to work at your operation in order to pay your dues to the Galactic Empire and take over the planet. Also, don't forget the most important thing... placing the top brass of the world under your feeler!

In a distant kingdom ruled by ambition and fire, an aging monarch dreams of expanding his legacy. Obsessed with conquest, he sends his sons to subjugate the neighboring provinces — once peaceful lands now protected by a mysterious and fiercely resistant coven of witches.
 
But fate has no loyalty to bloodlines.
 
During one of these brutal campaigns, the king’s eldest son — his pride, his heir — falls in battle, slain by arcane forces that no sword can match. Grief soon turns to rage. And rage calls for vengeance.
 
Desperate to strike back, the king seeks out a warlock long banished from the royal court. The warlock offers help — but not the kind the king expects. Through a dark and forbidden ritual, he raises the fallen prince from the grave… not as a man, but as something else. Something hungry. Twisted. Unnatural.
 
Now, a creature of lust and undeath walks the earth once more, driven by a primal desire to defile and destroy the witches who ended his life — one coven at a time.
 
This is a tale of power, corruption, forbidden resurrection… and the sinful magic that binds them all.

The girl opens her eyes in a desolate world, and hears "your" voice from in front of the screen.
You can direct her actions, help her solve mysteries, evade dangers, and find a way to leave this place. Of course, you could also choose not to do so, or even worse, deliberately guide her to death... Just kidding, you surely wouldn't do that, right?

Due to certain circumstances, Leona, a gunslinger, is living on the run in the wilderness.
One day, she happens to stop by a bar in a town where she meets a suspicious demi-human named Lurie,
who invites her to a fighting tournament at the Colosseum, and she decides to participate.
If she keeps winning the tournament, she will be absolved of her crimes.
However, if she loses to her opponent, she will be immediately and publicly raped, and then become her opponent’s property…in other words, her slave.
The once-in-a-lifetime challenge begins to determine whether she will become the champion of the arena, or become a slave to be used for the rest of her life.