The White Which Lives Within the Ink Stone (Episode 10)

The White Which Lives Within the Ink Stone is the tenth episode of the anime series.

Synopsis
After some children sneak into Adashino's storage shed and find an ink stone, they become mysteriously ill. Soon, when Adashino is unable to find the reason for their lowering body temperatures, he calls upon Ginko for help.

Plot
Children sneak into Adashino's storage shed and find many strange things, and one beautiful inkstone. On the next day, they become ill and their temperature starts to decrease. Adashino visits one of the children and the kid apologize for entering his shed and explains they found an inkstone and rubbed some ink into it. Realizing its related to mushi, Adashino calls Ginko, but he can't figure out the mushi from that description. As the one who sold him the inkstone also doesn't know anything more, Ginko heads out looking for the inkstone maker.

Ginko reaches Tagane's house, who recognize her inkstone and explain she was looking for it. She explain that she knows three people who used the inkstone and had died a month after. As her father was inkstone maker, but became ill, she was to succeed him, but her fiance and his parents were against it. She decided to make an inkstone that will surpass her father's work and found a stone in a cave which she turned into the inkstone. Her father was impressed with it, but as she used ink on it, a cloud came out and she breath it. Tagane then crosses the mountain to go to her fiance house and shows him the inkstone and he decides to show it to his parents and convince them she has talent. But a month later, she receives news of his death after his body started to lose temperature. The inkstone was then sold and she tried to find it, but eventually lost track of it and after her father died, she decided to stop looking for it and stop making inkstones. Tagane wants to destroy the inkstone, but Ginko tells her it doesn't belong to him and she can come meet the owner.

They head back to Adashino and Ginko explains he figured it out. They take the children and head towards the highest nearby mountain. He explains the mushi is Kumohami, a cloud-like mushi that eats clouds and cause hails and snow, but if it doesn't eat for a long period, it gets condensed and fall to the ground and after eons, it likely turned to stone. Reaching a certain height, clouds come out of the children and their temperature return to normal. Ginko explains that since Tagane lives in high mountain area, the clouds were escaping little by little, but as she crossed the mountain, the mushi completely left her body. He explains the mushi came out due to air pressure as they live in certain altitude and were drawn to if when they got closer.

Later, Tagane wants to purchase and destroy the inkstone, but Adashino doesn't want to. After Ginko's suggestion, Tagane uses the inkstone to release all the mushi in it. After doing so, a hail starts raining breaking roof tiles and Tagane says she will pay, making Adashino how she will do that. Ginko suggest she can start making inkstones again and Adashino orders one. After some thinking, Tagane agrees to continue making inkstones.