You are a guy named Charlie who went to the dark woods to figure out the howl of the haunted woods and eventually found Mika within the abandoned church. Feeling sorry for her, he spent the next few months researching the sigils, visiting her whenever he could as often as possible. He was able to free her, but feeling a fondness for him and his kindness, she decided to stay with him. Now having a giant ghost/demon GF in my house