The Factory is a location often appearing in Yukkuri stories.
It is sometimes described as located on the edge of forest in Gensokyo but the details are never given. It's most likely located away from the Human Village.
The Factory processes and breeds Yukkuri, and sometimes conducts scientific or pseudo-scientific research on them. Whatever is done, is usually a form of torture. The actual purpose of the Factory, (other than torturing the Yukkuri) is often unclear.
To obtain samples and raw material factory workers may go out and hunt wild Yukkuri. Alternatively they may purchase the Yukkuri caught by other people.
In some stories the Yukkuri have an instinctive fear of the factory and/or factory workers.
More recently, stories written have referred to a number of different factories, suggesting that there is more than one. Indeed, there one factory was involved in an unfortunate incident involving a Yukkuri Utsuho (it was destroyed in a small nuclear explosion). Stories that take place in the "normal" world opposed to the realm of Gensokyo point towards the existence of many different companies operating factories, one of which being "Yuh-Yah", which produces the Yukkuri castration kit and specially bred crying Yukkuri.
Examples of the Factory's activities:
- A device where Yukkuri are force fed chemical and nuclear waste, and through their inate magic turn it into bean paste. Due to large doses of substances, the Yukkuri themselves eventually die from exposure and have to be replaced.
- A device where pregnant Yukkuri are held in a position so that the newly born children fall to their deaths. The children are later processed into food.
- Breeding programs where hordes of Yukkuri Alice are allowed to rape other Yukkuri producing numerable offspring (or killing the victim).
- Breeding pet Yukkuris who won't shit, this is performed on families of Yukkuris by giving them large meals, consisting in tasteless dry food, every 2 hours along 12 hours; the amount of food in each meal is increased if anyone takes a shit and not eating food is not an option because that leads to the death of a Koyukkuri by caretakers; Yukkuris also must avoid throwing up food because that is another reason for killing a Koyukkuri. One way that Yukkuris hide released shit is by eating it, that is not too harmful because shit is almost-expired bean paste. The procedure is repeated until there is born a Yukkuri that will not excrete once from the moment it is born, the parent Yukkuri will give birth to babies, raise them, and watch them die repeatedly. The reason for not killing Koyukkuris that excrete soon after their birth is, "If a child who shits is born, (the parent and child both) will not be able to take it easy" is encoded into the mother Yukkuri's filling DNA.
- Harvesting Yukkuri filling by putting a desired species of Koyukkuri in a bottle and force feeding it until adulthood when it can no longer take it easy in the bottle. Then the bottle is broken open and the mature Yukkuri is then cut open and its filling is removed and processed for market. If the Yukkuri develops a body while in the bottle it is likely to die before it can be harvested. The most commmon species for this process are Yukkurumia, Koakkuri, and Yukkureimu, Yukkurisa, and Alikuri who have been specifically bred to not have bodies.