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Last checked: June 20, 2017
Mouse began as a manga in 2000 and ran until 2004. During this time a light novel (January 31) and 12-episode anime (Jan 5 to Mar 23) was made in 2003. A prequel manga was also released in 2005.
For 400 years, there was a family of thieves stealing money and priceless property, particularly those items that were originally illegally stolen. The main motivation is that anything and everything can be stolen, no matter how much they protect that item. And in those years, that thief was only known by one name, Mouse.