A recent arrival, young Katie stood out when she revealed her ability to emulate virtually any person, regardless of gender, size and age. Her demon-god would often possess her to take her on wild adventures, and it wasn't until she went missing for three months that her parents drew in the attention of an entire nation to get their little girl back. Turns out she had no memory of ever missing when she was found by Madame Klein's girls, diagnosed and brought in to control her demon-god and take advantage of its power, lest it take advantage of her again.

Her demon-god's name is Syhon, an ambitious and loud monster that likes to have fun and indulge in everything humans have to offer. It has hopped from girl to girl for generations, robbing them of their entire life just so it can have one of its own.