System D, Inc. engages in the development and sale of software packages. It operates through the Software and Others segments. The Software segment develops, sells and customizes software packages for various industries such as schools, public education solutions, public accounting solutions, wellness facilities, municipalities, dispensing pharmacies and software engineering. The Others segment plans and produces advertisements and rents real estate properties for tenants. It also provides website planning and production. The company was founded on April 28, 1982 and is headquartered in Kyoto, Japan.