She deliberately let Miss Mary go back then, probably because she sensed that letting Mary escape would be more interesting than killing her, thinking it might provide some entertainment.
And indeed, the subsequent events unfolded just as she had anticipated.
Miss Mary became a Shikigami of Kamiyagawa, directly getting involved in the tale of the Kishin Disciple.
Aoandon must have been quite pleased to see this turn of events.
"If it wasn't for Lady Aoandon, Miss Mary probably wouldn't have become Kamiya's Shikigami," Onizuka thought to himself.
...
"Was there an Aoandon in Isehara before?" Kamiyagawa found himself wondering.
He also recalled some things.
It was around the early winter when little Satoru had just woken up in the Arakawa residence.
One lazy winter afternoon, Kamiyagawa played with Satoru in the study like one would tease a cat, and then he had a casual chat with that young girl—
