Lady Stalker: Kako kara no Chousen

There once was a very rich family who had a daughter named Lady. They
loved Lady very much, but she was something of a delinquent. Where Lady
went, destruction followed. In order to curb her destructive tendancies,
the family locked Lady up in a mansion, and left two servants- a cook
and a gardner- to watch her. However, one day Lady heard of a place
called Deathland Island, which was said to have a huge, ancient
treasure. Determined to find this treasure, Lady made her escape...

An isometric RPG, Lady Stalker was the sequel to the more adventure game focused LandStalker.