It's been years since yukkuri appeared in this world and researches has been done about them. Yukkuri has also been so integrated into the society that if you do a survey, most peoples would straightly say they consider yukkuri to be beneficial.
The M City in particular is very accepting of yukkuri.
Every morning, the peoples in the neighbourhood will open their door and greeted politely by group of yukkuri.
One of the house had two Marisa and a Patchouli and a Chen. They're shouldering a contraption made from stick, board and plastic bucket. Every morning, these yukkuri are asking for domestic trash. They've been doing this for long time so the weight of the trash is not much of problem for them. They're also thankful for the trash.
The house owner who walks out to pick up newspaper also opened the door to let the yukkuri go. Before the yukkuri left, the lady of the house doesn't forget to give them a greeting, "Take it easy".
The route is determined by the cleaning department. Every yukkuri group will visit four houses before they all marched in row to their destination. All the while, the yukkuri crawl as fast as they can, not making any voice and keep smiling. They're not causing any trouble to human.
But when they reached outskirt of the town where there's less peoples, tears starts falling from their eyes and sobs can be heard leaking out of their paste. Human called the path formed by soil moist from the sugary tears as yukkuri path of weeps.
In other place, yukkuri did another kind of work. At the front of the station, a group of Marisa is doing shoe polishing.
This town still has many farm, so the shoe cleaning is really helpful to the citizen whose shoes are dirty from the dirt and mud.
A salaryman came to one of the Marisa for shoe cleaning. Marisa used her tongue to diligently lick away the mud. The man also doesn't forget to remind Marisa to say those words, "Lick lick happyness! Marisa is thankful for being allowed to lick lick Mister Human's feet clean".
This man is not an abyuser, in fact he likes this Marisa more than the other shoe polisher Marisa. She always do her job well and her tongue also doesn't go so much to touch his ankles. Yukkuri whose given special position (even as shoe polisher) and having human saying thanks to them could quickly grow big headed and thought human must let them take it easy. Those bad yukkuri would be sent to Factory, so this is his way of showing care.
After Marisa finished, he opened a drawer in Marisa's box and pick out a candy for Marisa. The drawer is designed so only human can open it.
Although this Mister always looks uneasy, Marisa also likes this customer because he always pay for her service with precious sweets sweets. Before they parted, that man gave her a greeting.
Other Marisa can only feel envious seeing Marisa put the candy in her hat.
The candy smell and taste a bit uneasy actually. Even so, it's still a precious sweets sweets yukkuri know to be easy by instinct.
The reason for the uneasyness is because this is not just a candy. It's main purpose is to act as disinfectant for the yukkuri's mouth and as shoe polishing cream.
For this, the manager told the yukkuri to only eat the candy before they serve a customer. Most yukkuri forgot that after their next poo poo, but Marisa can remember that teaching. In fact, the bad individuals are weeded out already so those left are actually the better ones.
These yukkuri are allowed to stay in the larger modified coin locker and always feeded with yukkuri food. Their life is a lot better than the cleaning yukkuri.
Cleaning yukkuri in the other hand is the first kind of yukkuri that made human changed their view about yukkuri. These yukkuri go around the town, picking up any trash they found littering the town.
Not only trash, they also clean corpse and dung of yukkuri and animals.
These yukkuri are supplied with Yu-bon, a concentrate made of artificial colouring, sweetening and aromatic agent to look like orange juice. It's clearly written to not give this solution to anything else because it's poisonous. But for yukkuri and their power of belief, although their paste recognize it as poisonous, they also believed it to be orange juice that can heal them.
Of course, not all individuals can take the dose of poison. Everyday there are casualties from poisoning. It's the duty of the yukkuri to eat those corpse too.
According to the manual book, the person in charge usually tell them, their dead friend or family wouldn't like to be stinky too so at least let them take it easy in your body.
Yukkuri workers are usually yukkuri loving person, so they don't want to use that tool.
That tool is a metal stick called yukkuri stick. Every Factory has their own secret recipe, but in general these are sticks smeared in paste and death stench that it can affect yukkuri around by inflicting memories of the dead yukkuri at the moment of their death.
Those in close range would even got broken. Yukkuri in at least 50 metres range would be disabled and most will vomitted their paste. Even a Dosu Marisa would die on contact from the shock.
The strongest one, of the "paste core" line, can kill all yukkuri in 100 metres. Well, the existence of that one is like a myth and it's said that the stick is used when yukkuri problem got so out of hand that humans are forced to clean all yukkuri in a town including pets.
These sticks are standard equipment of any yukkuri related workers and it's kept safe in a fragrant sheath to cover the death stench. Don't want those yukkuri dead yet.
The yukkuri are arranged in group and they watched each others. Human who spotted yukkuri slacking in their job can easily report the case to the office and said yukkuri will be gathered to the disposal box to be sent to Factory in weekly basis.
Recently, the case of prank call from abyuser has diminished. Actually, many of the calls actually came from Gold Scum who got yukkuri cellphone from their owner.
Unfortunately for the cleaning yukkuri, they're cheap and disposable. The office wouldn't confirm the report, they just dispose the yukkuri and get replacement.
If there's a lot of complaints, then the whole group will be disposed. This pressure made them watch and remind other members of their group to do work.
Moreover, these yukkuri are produced in the Factory so they have a very strong fear against Factory.
Surrounded three ways by the watching eyes of human, yukkuri and their fear of Factory, the yukkuri really concentrate on their works.
But in the other hand, human can feel it's alright to left the yukkuri do jobs in their own way without much rules. They're even allowed to marry and have little ones, which usually happened to fellows in the same group. After all, yukkuri has 100% chance of getting knocked up after refreshing.
Of course this has nothing to do with rest. Pregnant yukkuri still has to work and their children usually dies, often with their mother. Stalk yukkuri would fall off, or baby in their mother's body die of impact shock. Accidents also happened all the time, stacked with stress and lack of nutrients.
Some babies are born, but most never survived because there's not enough food. The baby can't drink the poisonous Yu-bon that can even kill adult. There are individuals who let their baby suck their paste, but this is too painful like cutting off their organ.
Those growing big enough to work are usually let to be in the same group as their parents. After all, the workers doesn't really hate yukkuri.
Sometime, there's also yukkuri who got lucky and human would let them have a bit of easyness. Like this yukkuri group.
The young man saw Reimu waiting for his trash and another Marisa cleaning up dog dung. He left a little juice for them to lick.
He's thankful because thanks to the yukkuri, this city is clean.
The yukkuri also doesn't have to eat all the trash. Those they can't swallow will be thrown inside the bag they bring. Their job is to collect trash, not process them.
Of course, these yukkuri are the lucky one. Most of the cleaning yukkuri are used to clean toilet.
The yukkuri carrying trash are heading to the sorting site outside the town. It's a massive building where trash are then sorted by thousands of yukkuri (nobody know the exact number).
Thanks to these yukkuri, the town doesn't have to bother with sorting trashes because the yukkuri do it for them.
As the key of this is army of gold grade Patchouli made in the Factory. First a baby Patchouli is put in "education" chamber, secured so she can't move. Nutrition and excretion is done through tube. What the Patchouli do is just to be forced to accept informations regarding trash sorting.
The Patchouli's paste, filled with knowledge about trash and nothing else, is then transplanted to mass produced Patchouli because the original has no knowledge except that programmed into them.
By transplanting paste, one data Patchouli can be used to make 50 manager Patchouli.
Trash sorting job is dangerous and many yukkuri died everyday from accidents involving heavy and massive amount of trash as well as dangerous things such as sharp object and food with taste that's too salty, bitter or hot for yukkuri. Their only lifeline is the Yu-bon drink that's uneasy either.
After job, the main leader Patchouli report to worker who wear overall and has his face covered in mask. This is to make the yukkuri unable to recognize them. All the worker treat each others as equal because if a yukkuri saw one of them bowing down to their superior, the yukkuri will instantly thought the human is lower than them too.
Everyday after work, the yukkuri are given present of sweets sweets. The use is left to Patchouli's decision. Usually it's either being kept for emergency, ate right there, or given to certain individuals who had done good work.
At first, the pocket that leader Patchouli have is a present from a worker who likes yukkuri. But seeing that the practice increased productivity, the human gave same treatment to the leader Patchouli in other sorting sites too.
These yukkuri are made from Factory and they have high turnaround rate.
There's been theories about yukkuri and one of the most accepted theory is that they're creature of Decatose, a yet undiscovered type of sugar.
This sugar can send electric signal and formed the neural system of yukkuri. It also provided energy to the yukkuri.
Yukkuri's metabolism are fast, so they will quickly deplete the sugar inside them and needed to excrete those used paste. To replenish this, the yukkuri's sugar has the ability to absorb and convert other materials into more Decatose.
What yukkuri consider as "easy food" such as sweets sweets are actually food that's easy to break and convert.
Another phenomena is the creation of Decatose by uneasyness. This explained why yukkuri became sweeter as they're tortured.
It also explained how yukkuri is so suicidal. Despite their mind, their body wanted uneasyness to produce more Decatose or else they will cease functioning.
Pet yukkuri can become scum, or they die from unable to attain uneasyness. This answered how a well cared pet yukkuri can die faster than stray.
In the Factory, one of the production line is the mass production of pure Decatose. About 1000 yukkuri is kept in a place and covered in mist of orange juice. They're bombarded by three speaker (the maximum yukkuri can comprehend the number) with "Take it easy" every one second.
It's so fast, the yukkuri can't even respond to the greeting. This is very frustrating because the most primal instinct of yukkuri is sharing easyness by doing the greeting.
Left in this high stress environment, the yukkuri grow fast. When peeled, their paste is almost transparent from the amount of sugar and uneasyness.
This Bio-decantol is used as new generation fuel and has been powering the world.
In poor countries, Decantol is also used as alchoholic drink and until now there's still no apparent bad effect to human.
That's how yukkuri got accepted by human into the society. They know yukkuri actually needed to feel uneasyness. The only nice thing they gave are "Take if easy"
Note: need lots of check and maybe I missed several parts. Too sleepy