This is a children's book and for the kids I think it'll hit the mark, with both a level of scary and weird. It will also introduce them to Yokai - the monsters of Japanese folklore.
It features a girl, Miku, whose family have moved to England from Japan. Miku was told all about the Yokai by her grandmother, sadly deceased, and some of the methods to hold them at bay. Her mother does not share her beliefs and removes the protective leaf Miku placed above their front door. This allows the Yokai entry into their home and lives - the worst being a nukekubi, a carnivorous demon that leaves its body behind at night whilst its head flies off in search of victims.
Undemanding for an adult reader, but still a fun enough quick read, I can imagine that this will become a firm favourite with younger readers. Recommended.