SystemSoft Alpha Corporation is a Japanese software development company.
Formerly just "System Soft", they have a long series of mainly military strategic simulation games (generally hex-based) popular in the Japan market.
SystemSoft Alpha initially was to develop for all console based games while the parent SystemSoft focused on Windows and Macintosh editions. Now the SystemSoft website focuses on more general software solutions outside of games, while SystemSoft Alpha is the game-making arm of the company. The main website for the game division, regardless of platform, is now SystemSoft Alpha, but "Alpha" still is not seen in the logo of the company on game boxes.
Only a handful of the dozens of games in their portfolio have ever been translated to make it to English-speaking markets. Part of the reason for this is that the main platform for their games for almost a decade was the NEC PC9801.
Source: Wikipedia, SystemSoft Alpha, available under the CC-BY-SA License.