Newlywed Sexual Life Survival RPG

The protagonist and his childhood friend, Nanami Mitsuki, get caught in a storm during their trip and are stranded on a deserted island.
As they live with the goal of simply surviving, their sexual urges gradually build up…
To relieve those urges… they start helping each other masturbate!?
Will they be able to build a boat and escape the island without being consumed by their desires…!?

Once upon a time, this world was at peace.
Humans and animals lived together with magic.
But one day, terrifying monsters appeared.
Behind them was the Demon King.
Humans joined forces to fight back.
Many brave warriors also rose up.
But the Demon King's power was too great, and the town burned, the sky turned red, and many people fell.
In the end, most of the world was taken by monsters.
 
Only one thing remained— A small island far, far away across the ocean, "Nokosare Island."
There, a lone surviving hero lived. His name was—"The Hero of the Farthest End."
When the world sinks into darkness, a small hope is born.
Most of the world has been occupied by monsters led by the Demon King's army, and the many heroes have been defeated.
Manage the sexual desires of married knights and monster girls and enjoy a harem siege life in humanity's last bastion!
Seduce the voluptuous married knight commander and indulge in baby-making sex to your heart's content!
Will the day come when married Faris throws away her wedding ring...?!

During the summer vacation when his parents are away, he begins living with his step-sister.

Umeko Aoki had been living a happy married life, but lost her husband in a sudden accident, and hit rock-bottom.
A few months later…
Though filled with sadness, she gradually got used to living alone, and began to feel hopeful for the future…

This is a battle between the fateful power of men and the irresistible temptation of women.
A mysterious power unique to women, discovered over a decade ago, [magic]—has disrupted the power balance between men and women in society, and completely changed their relationships.
 
Women, with their powerful magical attacks and seductive allure, began to treat men like slaves.
Men began to call these women "witches" and hate them.
 
This conflict soon escalated into a war between the sexes, and now the men's country, Barbat, has been pushed to the brink of destruction.
Just when Ren, a soldier at Barbat, thought his demise was numbered, a resistance movement from the women's country, Fata, appears before him.
 
She says that Ren's [intellectual power] is needed to restore this distorted society to its original form, but...