SUCCESS is a game development software that widely handles overseas localizations. Established in 1978, it focuses heavily on developing in-house tools for creating games across various genres. In addition to their own development and sales, they undertake a vast number of projects including contracted development for major companies and publishing games developed by other companies, leading to a significant number of releases.

Previously, they were also involved in planning and developing pachinko and pachislot machines, as well as anime production. However, to allocate more development resources to games, SUCCESS established both of these businesses as a separate subsidiary, 'Success Plus,' in 2022.