This is a place deep in the mountain, far from road or hiking trail. In this place, a yukkuri clan is preparing for winter.
Then a car came. Inside is a pair of human. This man and woman has been together since their university days and having romantic relationship. Today, they are coming to enjoy autumn in the wild. This is the man’s secret spot.
They both open a camp, setting up tent while the yukkuri clan who never saw human watches in amazement on how quickly these humans built their home. Their leader, a descendant of ex-pet Patchouli stopped the clan from getting close to the human. From the paste memory she inherited from her ancestor, she had an idea that human is dangerous.
After building a tent, the human played a record of house declaration, claiming the tent as the human's home. According to yukkuri's instinct, house declaration is absolute, so they can't take it.
Reimu and Alice, the yukkuri entrusted with home building in the clan is even jealous of the really easy house these humans built because of its big size.
Patchouli came to the human and asks them what they are doing here.
The man then told Patchouli, they're only staying for a day and will go home tomorrow. He answered Patchouli because she's the clan's leader, but after this, both of them had no interest in interacting with yukkuri and will ignore whatever they do.
Patchouli went back to inform her clan that Mister Human would go home tomorrow. However, she also assumes that the very easy house that Mister Human built (the tent) will be left behind and they can claim it later as their communal hibernation place.
All the yukkuri is very happy. Of course, yukkuri have bad sense of scale so they never thought that even though the tent is larger than their nest holes, there's no way the whole clan will fit in there.
First, the couple lay down and enjoyed the view in the mountain.
This clan has many hard workers. To prepare for winter, the Marisa and Chen went to hunting several times a day while the Reimu and Alice prepare their nests. However, seeing the human taking it really easy, they all gathered to watch.
Patchouli told the clan, maybe they should take it easy today. This is not merely because Patchouli want to take a rest; if she keep everyone working, there might be angry yukkuri who attack the human and doomed their clan.
After waking up, the human prepared their lunch, barbeque of vegetables and meat.
The smell reached the yukkuri. They've never ate meat before because they're not strong enough to hunt those animals. City yukkuri might know the smell, but these mountain yukkuri never met human before. Yukkuri also don’t know fire, so they never know about taste of cooked food. Moreover, the foods look so tasty and easy to eat.
When the yukkuri continued their own lunch accompanied by the smell of the barbeques; not much "Happyness!" can be heard from the families. Compared to what the human eat, their food is not that tasty.
The man went to the river to fish, his hobby. Marisa and Myon who also used tree branch watched human taking a long pole. He swing the pole and fish came out of the water (yukkuri didn't notice the string).
Marisa and Myon want to try it too. Yukkuri never eat fish, but they “learned” that you only need to swing a stick on the water and fish will jump out. Myon took out their Hakurouken and Marisa took out their oars. They tried swinging. Those not so lucky falls into the water while the less unlucky ones lose grip and had their precious branches washed away to their distress. There’s also yukkuri who jump to the water and died.
The woman had different hobby. She likes to gather edible plants. The yukkuri hunting in the forest watched in awe as this human choosed plants they thought is inedible and picked up fruits too high for them to reach. Not to mention her speed is amazing (for the yukkuri).
First, the Alice with weaker stamina gave up following and returned to the clan. The Chen keep chasing until halfway, and they don't know the way back to their clan, including the best hunter Chen in the clan. Nobody noticed the plastic tapes that woman stick to the trees as her waypoint back.
Before preparing dinner, the man went back to the river to get water. Accidentally, a fish swim into the bucket, but he doesn't need it.
The Marisa who's still trying to swing their fishing pole saw it and think, just scoop the water. Many had their hat washed away as a result while other stepped too far into the river and die.
Youmu tried to help, but the stupid ones jumped into the river while those offering their "sword" to hold got pulled by several Marisa and fall into the river.
Dinnertime, once again the yukkuri is introduced to an alien taste from human’s cooked vegetables, rice and fish barbeque.
They also realized something. The hunters are not returning.
Night has falls, so Patchouli told everyone to wait until tomorrow before looking in the forest. The Alice and Reimu returned to their nest and have their dinner in sadness of losing their family.
Once again, they ate their bugs and grasses silently, mixed with the delicious smell of human’s food. That night, there’s no “Happyness!”
Covered in sadness, the wives cried and can't sleep. They went out of their nest into the cold winter night to wait for their husbands to return. Right then, they saw both humans chattering together with a lantern on the table.
"Mister Human is hogging the sun!"
For yukkuri in the mountain, there's only two source of light, the sun and the moon. The bright one is the sun, and human has captured that sun. They're so scary.
Next morning, the humans prepared to go home. There's an uproar in the yukkuri clan.
The very easy house built by human is gone, the house they planned to use to spend the winter (they think house is permanent like theirs and will be left behind as the owner moved).
Thirsty yukkuri went to the river. There, they found the corpses and accessories of the Marisa and Myon who attempted to catch fish yesterday. There’s so many that not all got washed away.
The Alice who went hunting yesterday look for the Chen who chased the woman, but they can't find those Chen.
Angered, Patchouli's husband, the strongest yukkuri Marisa in the clan went to fight the human.
Purely by accident and Marisa's miscalculation, she stand right under the woman's next step and get crushed instantly. Both humans only think it’s an accident, but at least wild yukkuri is cleaner than strays.
Yukkuri clan watched as their strongest is killed.
Patchouli, who made the plan of communal winter house is executed by the Reimu who lost their husbands.
What's left in the clan are just Alice, Reimu and a few of Marisa, Myon and Chen. There's not enough hand to finish the preparation for winter.
After knowing the delicious smell from human's meal, the yukkuri can't eat their food without that smell anymore. Their taste has been ruined just by that smell.
Three days after suffering hunger and stress, the Alice in the clan turned into rapers and killed all yukkuri in the clan. After that, they went into the mountain, getting lost and finally dies.
After a week, there's no single yukkuri left. The clan has been destroyed.
The couple married and had happy life in the city. Later they also had children.
Every year, they went to their secret camping spot.
There's several other yukkuri clan forming in the place, but all of them ended. But the human never know what they had done.