Locked up in a Temple for a long time. Jace was released by Anita who was trying to write a project for her history class so has to be able to join the school play.
Jace gave Anita his fox bead in other to save her after falling from the top of the mountain.
Jace followed Anita to her school and started living with her because of his fox bead that with Anita

My boyfriend is a nine-tailed fox

The whole Ashen Forest area was so quiet that the Shattering of the World Tree felt oppressive. Though the light that formed the trail was leading them, Anita had this feeling that someone was following them. All the shadows, all the movements of branches, felt as if people were watching her. 


Jace seemed perfectly composed; even his tails, which lit up in the darkness, seemed to throb gently as they walked. His eyes were forward, but his ears flitted occasionally to every slight sound that penetrated Anita’s ears. 


“You’ve done this before,” Anita said, after a while. "Haven’t you?" 


Instead he looked at her and then moved away, Jace’s face telling no one what he was feeling. “Not exactly this,” he agreed. But I’ve been tested by the shadow before. That is why tyrants, psychopaths, and all sorts of dishonest people love fear and doubt in them. You did well back there." 


Çhapter 133: Echoes of the past