The princess of Eientei.

Even her current activities are unknown.

Eientei is a mysterious place which keeps lots of rabbits, even youkai rabbits, but it seems that she is its mistress.

Lately Ms. Yagokoro has started selling medicine there, but until then nobody even knew of its existence.

What have they been doing until now? What is the significance of this mysterious woman's organization? And the like. The mysteries surrounding Eientei only continue to intensify.

However, as the mansion has recently begun to host events and the inhabitants are beginning to appear in the human village, the opportunities to meet the proprietor of Eientei are increasing.

The princess of Eientei is surprisingly refined in the art of conversation (*1), and will engage listeners in a variety of old tales.

Perhaps the blind biwa-playing monks of old were related to her somehow.

1: Though her manner of speech is quite dated.

She possesses the ability to manipulate eternity and the instantaneous.

As eternity refers to a world with no history, it is also a world where change is eternally unknown.

No matter how much you may try to bring about change in such a world, it is futile in a world where time has essentially stopped.

It is believe that even the fact that Eientei suddenly appeared in human history and began to experience the passage of time was because she undid the effects of her eternity magic.

Under the effects of that magic, Eientei would probably have never appeared in the human world, but would have always remained hidden in the Bamboo Forest of the Lost (*2).

However, a perpetual world denies any sort of change.

She may have lived for a very long time without having changed at all.

Her other ability regarding the instantaneous is complementary to her manipulation of eternity, and allows control over extremely short time durations.

It allows her to act in instants so short as to be imperceptible to human beings.

Since time itself is just the aggregate of instants, they pass normally as time, but these instants cannot be perceived by humans.

In using these times, it's said that she can have several parallel timelines.

As both of these abilities are abilities to manipulate time, they far surpass what normal humans are capable of.

2: Even its name "House of Eternity" implies this.

The exposition was an event where Eientei opened itself to the public to display various Lunar goods and informational exhibits, giving the public a chance to find out about the manor and the moon.

Relations between Gensokyo and the Moon ceased long ago.

The exposition was a great success among both humans seeing the subjects of the exhibits for the first time and among youkai who came to reminisce about the past.

Due to the nobles of the Lunar Capital being hesitant to communicate with the beings of Earth, and it was a long time since so much discussion had occurred.

The sudden opening of the exhibition sent a shock through Gensokyo, and there were few whose interest it didn't capture.

Most of the displays at the exhibition could be divided into three categories.

The first is the classic category of amazing items, such as carriages that fly through the sky, garments that make the body light enough to float through the air, the rabbits' mortars, etc.

These exhibits make it possible to imagine the lives of the nobles living in the capital of the moon.

The next group, the military category, provided a stark contrast to the classics category: a vulcan cannon light enough to wield with one hand, an ultra-small Planck bomb, a roving tank designed for lunar exploration, and other modern weapons.

This gave viewers a glimpse at the incredibly advanced technology of the Lunar Capital.

The final group was the academic category, which consisted of exhibits of materials: the books of lunar history, divine medicine, mathematical philosophy, mad grimoires, etc.

Even though the books were written on paper, they still used advanced technology: the pictures moved, solid forms would pop out of the pages, and unfamiliar words in the text would be explained in incredible detail if you simply touched them.

Unfortunately, they were all written in the Lunarian language, and alas, completely incomprehensible.

As the exhibition was extremely popular, the proprietress announced her intention to hold it yearly.

It appears that they're preparing some sort of stage in order to hold a performance next time.

2: Even its name "House of Eternity" implies this.