Filia was once a somewhat normal school girl, until her parents were killed by mobsters, with the parasite Samson fusing with her to save her life. She is currently homeless and suffering from amnesia. Samson is a purple-black colored parasite attached to her head, acting as her polymorphic hair, with a mouth on the back of her hair as well. After her amnesia Filia is naive, curious, and is still as caring as she was before she lost her memory. Samson is a brash, rowdy parasite, but protective.