Technōs Japan
The game is based on "Kunio Kun no Nekketsu Soccer League" for the Famicom which was developed by Technōs Japan on April 23, 1993. However, "Soccer League Plus" is not a sequel to its two predecessors, but it is a continuation of the "Chō Nekketsu! Daiundōkai" in which Michael Tobioka and his crews are back.