Our preceding paper presents a hypothesis that dynamics of TV game-software industry can be adequately perceived from the viewpoint of industrial clustering and insists the finding of "Tokyo Game-soft Cluster". This paper attempts at inquiring why the observed clustering has been emerged. Major factors affecting the firm's locational preference include the quality of developmental condition of a certain space defined by the existence of educational insitution, access to market, etc. The paper also emphases the amenity aspect of the space, i.e.the quality of community life inviting the flow of innovative creators. The most remarkable area from this viewpoint is found to be "Yamanote-line South" Cluster.