The Lumier Household's Only Daughter

CAUTION:
This is a PURE ENGLISH book.

The household only believes in one thing, which is "Once forgotten, cut the ties."
An unbelievable story due to its author's fanatasies, wherein sci-fi was added.
A book where miracles clashes with facts and theories.
A curse that runs in each member of a family. To solve and to survive.
To obtain happiness which cannot be given.

Will our protagonist save humanity from the evil that lurks in the dark? Or will she not?