Episode 16 - Believer

Satella wakes up from a nightmare of when a demon attacked her. She is angry that Rosette has agreed to work with DeFaux. In the parlor, the butler tells Azmaria that the Harvenheit family will support her musical career. Chrno goes to hand Rosette a piece of cake, but as she goes to take her, her wound hurts. She refuses the cake, making up an excuse. Satella enters and the butler hands her another notice that a person is missing. She leaves immediately to search for the person. Back at the Order, some of the nuns run into DeFaux's men and are terrified of them. Up in the meeting room, Rosette works with DeFaux and the West Coast Order to figure out the best plan of action. They figure out that there was devil worship going on inside of an old mine and realize that they should start there.

Meanwhile, Satella is going to the same old mine, searching for the missing person. She sees something twinkling in the darkness and goes to pick it up. A trap door opens underneath her and she falls through. As she gets to her feet, she asks who is there. Holding up the lantern, she sees the corpse of the worshipper. As she looks around, a woman appears behind her. Satella tries to attack her, but a snake comes up from behind her and strangles her into unconsciousness. When she comes to, she finds herself chained to a wall and the woman chanting in front of an altar. Back at the Order, Rosette learns that Eliza Brown is one of the missing people. They believe that she was used for a sacrifice.

In the cavern, the chanting woman summons Aion. Aion recognizes Satella, making the chanting woman jealous. She apologizes to Aion though, for chosing someone he knew, and promises to let Satella go. Aion kisses her, then walks towards Satella. He asks if Satella hates demons as much as he has heard and she replies that she does. He holds up her glove, which has the jewel in it and smells it. He then tells her that a long time ago, there were a people from a black forest who could summon animals from jewels. They were destroyed, but one girl from the village was allowed to remain. As he destroys the jewel, Satella recognizes him as the demon who destroyed her home.

Outside, Rosette and Chrno notice a lot of bats circling around the mine. Chrno realizes that Aion is down there. Down in the mine, Satella cres as Aion tries to destroy her jewel. Aion tells her that her sister is alive, then kisses her. This angers the woman who summoned him. When she tries to kill Satella, Aion kills her. He returns to Satella, but before he can do anything, Rosette and Chrno enter. Aion asks to speak to her, but Rosette fires on him. She hits him at point blank range, but does not wound him. Feathers fall as he disappears, promising that they will talk again. After releasing Satella, Chrno apologizes for the day demons destroyed her people.