Alright, the plot is: in 1855 A man kills his family in Japan. His wife, his two children (One girl and one boy) and their beloved pet cat. At the same time in America a grieving alchemist to attempting to bring back his fiance, who died of led poisoning. Instead of getting his wife back he got back the vengeful spirits of the murdered children, and they 'take over; the house, killing the alchemist.
It is now present time and a couple dating move there starting their new lives, because both their parents kicked them out of their house, because they were disapproving of them. Eventually the children coem in, obviously. xD