A brief description of the manga Swept Away to a Reversed World: The Harem Life of a Rare Man Surviving in an Alternate World:
College student Sota Akizuki is swept overboard during a violent storm and believes his life is over. When he awakens, he finds himself stranded on a mysterious island in another world.
There, he learns that men are extraordinarily rare—only one is born for every thousand people. Because of this imbalance, the Kingdom and the Empire wage endless wars over men. In this strange world, men avoid women while women desperately seek them, creating a deeply distorted social order.
Trying to conceal his true circumstances, Sota acts as he normally would, only to discover that his very “normality” is what makes him extraordinary. In a world where a man’s sexual desire itself is treated as an overwhelming advantage, he begins captivating one strong and beautiful woman after another.
This is a pretty overused trope….
Let’s run an inn on Dungeon Island!
Valhalla pen1s mansion
I, the Only Male Knight in a Chastity-Reversed World, Entered the Female Knight Academy and Was Treated as a Hero for Some Reason: Unrivaled in the Harem with My Unequaled Skills
and many more….
Writer is scraping bottom of the barrel?