gumi America, Inc. | 758 followers on LinkedIn. gumi America, Inc. is the North American operation of Tokyo-based gumi Inc. gumi Inc. (Tokyo Stock Exchange: 3903) is one of the top mobile game developers in Japan and has developed and published hit titles locally and worldwide, such as Brave Frontier and Phantom of the Kill, on various platforms. gumi aims to change the world through innovative entertainment products and services, including both original content and collaborations with popular IPs.