Hailey Potter, The Youkai of grudge

After a near death experience, and meeting a certain Youkai sage, Hailey Potter, the girl who lived, finds a new family in the mysterious residents of the Yakumo household. Hogwarts is not ready for this new breed of Snake, who cant even be called human anymore (Genderswaped Harry, because a male protag in a touhou story is ridiculous, they don't even look good in floppy hats!)