Being the heiress to the successful Grace company, Lin Grace is often the target of kidnappers. To prevent this Grace's estate is located in a remote part of Japan that cannot be reached except by air.
The estate itself is so large that even Grace doesn't know everything about it. Numerous deadly animals have been released into the surrounding lands and waters to stop intruders.
Graces house is actually a European style castle. Claiming it's only her "room". It employees dozens of maids and has a private security force.