Alpha Denshi (also known as ADK) was formed in Saitama, Japan in July of 1980. ADK games span multiple genres though they are best remember for the World Heroes games. World Heroes was one of several games developed originally for the Neo Geo, a system ADK focused on exclusively during the 1990's.
The company went bankrupt in 2000. The rights to ADK's intellectual property were purchased by SNK Playmore.