There is a teenage human girl that can own a secret shop that is forbidden from the human world. Only those human-like yokai could see or enters this shop. This secret shop is given a name-三千世界(sansen sekai).
This shop sells many different things like old books, plates, cups and some other old things that is thrown by the humans. This shop may exist for more than 3000 years but how the building still looks so new like it just built yesterday, is still a mystery. Not even the oldest yokai in the world of yokai.
As for the 16-year-old boss of the shop. How can she be the owner of the shop only yokai can see? Well, this is a family business that pass down from generation to generation to her family.
According to the history of the yokai's this is the only shop that sells all the weapons, or even food and sealing scrolls to the yokai. Even the strongest ruler of the yokai world cannot hurt this owner of this shop. If the owner of this shop died, the shop as well as the owner, also will be gone too.
This girl maybe not as special as she is in the yokai world in the human world (her real world) but she is assigned all the products that had to be sold in her shop. Pretty nasty hah, she have to do all kinds of digging and finding all this products in the rubbish processing centres and rubbish bins too.
To prevent her secret to be reveal to the humans in the human worlds, she uses all kinds of techniques that she learnt in the scrolls to make the humans lost their memory or even scares them.
So, how long will this shop remains in the human world and leave unseen from the humans? Maybe it will be destroyed tomorrow? The day after? or a hundred more years later? No one knows.... ....
* Credits to the real artist of this picture 藤原 and visit his pagehttp://www.pixiv.net/member.php?id=27517 for more awesome arts, and credits to me for the story above I wrote myself.