A night walking brings an unexpected treasure — a black cat with a huge diamond! But is it a cat? Hogging her bathtub, robbing her food and asking her to warm its bed... She put up with it all for its diamond, but the petty cat actually absconded! After that, she was shocked to know that her new boss has a diamond on his collar, which is exactly the same as the one on the collar of the cat she met at that night...