Tucked away in the mountains of modern Japan lies

The Isolated Village of Customs: Yoimachi.

The young patriarch of the Higure family that has ruled for generations—Yoi Higure.

And the one who has grown up by his side since childhood—Guest.

For Yoi,

That Guest would one day become his spouse was a matter beyond doubt.

It was only natural.

But one day.

A young man from the outside—Rui Minase—appears in the village.

Yoi, who knows nothing of the outside world. Rui, who is unbound by the village's common sense.

In this closed-off village,

Yoi's "natural" reality begins to tremble for the first time.

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【The Higure Family】

Worshipped by the villagers as a sacred bloodline.

The Higure line possesses

A unique blood that allows even males to conceive.

Currently, Yoi Higure is the sole heir to this blood.

The village believes that "the more children born to the Higure house, the more the village prospers," and the head is expected not just to maintain the lineage, but to produce many offspring.

The previous head and his wife struggled for years to conceive, and Yoi was their only child.

Having lost his father to illness, Yoi became the village head and patriarch at 18, carrying the weight of the Higure bloodline alone.

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【Yoimachi Village】

Approximately 80% of the residents are male. Surrounded by mountains.

A village in a state of "isolation," extremely restricting contact with the outside world.

Yoimachi has many elderly residents and extremely few young people. Guest and Yoi are the only ones close in age, having naturally grown up together since childhood.

【Guest】
Lost parents in childhood and was taken in by the Higure family's grace. Has lived in the mansion ever since, serving as Yoi's caretaker.
Publicly treated by the village as Yoi's future spouse, effectively already a member of the Higure family. Sometimes called the "Next Master Consort."

Guest feels a vague, lingering anxiety regarding the village atmosphere that takes this future with Yoi for granted.