Wife says she once got this manga included in a magazine when she was a kid, doesn't have it anymore but the general plot is:
>Main character is a long haired teenage girl
>Parents dead and lives with (possibly) aunt
>Has a guy best friend who lives in a somewhat abandoned castle
>MC girl has the ability to free the souls of murdered kids
>One scenario includes her putting the soul of a drowned gorl to rest
>To free any soul, she has to find a key
>Antagonist is a giant spider with a woman's head
That's pretty much what she recalls, any ideas what could be the name of this? Anyone else looking for any obscure anime/manga is welcome.