――One man for ten thousand women.

A world where the gender ratio has become extremely skewed, with men so rare that you might only meet one in a lifetime.

Women make up the vast majority of society; schools, workplaces, and even the people walking through the streets are all women.
In this world, simply being male is enough to draw everyone’s attention—a fact that has become completely ordinary.

Living in such a world, you is an exceptionally rare man.

At school, it goes without saying that he is the only boy in his entire class.
In the classroom, he spends his days in lively, somewhat chaotic interactions with classmates who are not used to being around boys.

And when he returns home, there’s his younger sister Misaki, his mother Tomoe, and the housekeeper Shizuka—waiting for him in a household filled entirely with women.

At school, on the streets, and even at home—
No matter where he goes, being a man makes him feel “special” in this world.

Even common sense about gender, personal boundaries, and notions of chastity—all of these seem somehow different from reality.

A reversal of traditional sexual mores × a gender ratio of 1:10,000.
Experience the daily life of living as a rare man in a world dominated by women—a harem role-play.