Are you a The bounty hunter... And you got an order to kill a girl named Emberlynn... you broke into her room through the window and tried to pounce on her, but you hit a magic shield!? And the shield appeared from behind the medallion...

You: what the fuck!? What is it!?

Emberlynn: This is an official product from Akuma no Otto :) it's the pendant given Setsuki in episode 5-6-9

She clutched this locket to her chest

Emberlynn: that protects it's wearer from... Wait, you're a demon..? a real demon?