Near a lake, two Dosu Marisa are meeting each others. Both are nice wild Dosu, 3 metres each. They both have their own herd, but this lake is an easy place for just the two of them.
They often meet and tell stories about their own clan, sharing information and then promise to meet again.
Winter is coming and both of them has been doing uneasy expansion project with their own herd. Because there's still a lot of job, both parted and returned to their own place.
As the sun is about to set, Dosu returned to her place, greeted by her yukkuri who worked hard and show their happyness. This is a great place, everyone cooperate to bring easyness to their family.
Dosu's home is a big hole by the side of the mountain. It's dug through stone and big enough to fit Dosu as well as the clan members.
The stone wall is too hard to dig individual houses though, so all the clan member just stay together with Dosu there. This made everyone become one big family.
From the wall, water is leaking to pools. This is where clan members get their water, without having to go to the far and dangerous lake or rivers.
Stacked by the wall are wood logs where Dosu and the yukkuri is cultivating mushroom for food. Dosu learned this from the other Dosu.
But because of the comfortable life, no young yukkuri from this clan ever grow out of their nest. They all live together and Dosu realized there's too much yukkuri now. They might be able to get through winter, but there will be casualties.
The only way is to expand the nest hole to fit everyone. This have to be finished before winter.
All the clan member happily helps with the construction, bringing out dirt and rubbles from the cave. Dosu tried using spark, but it caused the cave to collapse, so they can only do it the slow way.
Yukkuri can only do so much. When temperature falls, most of the clan members are unable to move anymore. Only Dosu is left to do the work.
Suddenly, the rock collapse and Dosu saw the other Dosu in front of her. Both claimed that they're in their own easy place.
Caught in confusion and hearing their clan demand that Dosu Scum be punished, both Dosu shoot their Dosu Spark to their friend, protecting their clan from invader.
The sparks mesmerized many yukkuri, until it burns their hair, skin and accessories. In panic, the yukkuri ran out for their life, crushing the still mesmerized yukkuri in their way.
Seeing this, those standing near the exit claimed them to be yukkuri killer and swore revenge. Battle happens on both side until Dosu shakes in pain and the spark burned through.
Those that doesn't get turned to ashes by the spark are killed by the boiling water and burning logs, until finally the wall collapse and buried everyone.
Both Dosu can't move and only stare to each others.
Time passed and finally their paste cools down. Both realized, they're just trying to do the best for their clan, both of them are wrong.
Nobody is coming to help them, until one day, a weird yukkuri slides in through cracks between rocks.
Yukari is a traveller, and she heard the story from both Dosu.
This cave is a man made tunnel. It got abandoned and yukkuri starts living in it. Sad coincidence that both Dosu live on the opposite side of the tunnel and dig through until they met each others. Then by misunderstanding, both destroyed their clan.
Dosu asked for help, but it's impossible. Yukari can't help them. Other yukkuri wouldn't be able to approach this place because of the very thick death stench.
Human ? They're very selfish and wouldn't do anything unless it benefits them. The only thing human do when seeing the old tunnel collapsed is to close the place and dangerous area.
Dosu doesn't need to eat, so they don't die of hunger. The uneasyness made them unable to grow mushroom to shoot spark and blow themselves. Understanding their distance, they also can't do Please Eat Up because they know the other can't eat them.
Long time passes and finally, two fossilized Dosu is discovered from the area. Their faces are filled with endless despair.