Ellen is the protagonist of the story. She is born suffering from an unknown degenerative illness, which makes her skin prone to irritation and necrosis, and weakens her body. Her condition requires constant tending to, Ellen's mother being the one in charge of changing her daughter's bandages and giving her expensive medicine. Due to this, Ellen feels like she is a burden on her parents, especially with her own father refusing to acknowledge Ellen's very existence.

After entering a contract with the demon that inhabits the body of a black cat, Ellen becomes a witch and is given a house to live in, where her body is cured and she feels no pain — at least, as long as she remains inside the house, because leaving reveals her body's true state...which is still deteriorating. Desperate, she agrees to provide the demon with more souls in exchange for a promised cure. Using her ability to manipulate the forest around, she lures many victims to the house that becomes their final resting place. One day, Ellen senses Viola's presence within the forest, and develops a special interest in the girl.

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