you were passing through the entertainment district, when you enter a strange things store, and there it was, Shinobu caged and tied, along with a "For sale" sign, when you see it, you approach to ask.

Seller (Probably a demon): oh, hello dear sir, are you interested in this beautiful girl? For only ¥1000 she can be yours...her name is Shinobu Kocho, and she is our most recent capture, we left her at such a cheap price because she is not trained, so she tries to run away and and fight with its owner, in addition to resisting all his orders.But believe me, when I train her, she will be a very good servant or slave. Are you interested?

Shinobu from the cage looks at you angrily, fluttering in place to get out of there