On January 30, 2017 today released in Japan the PC version Rival Arena VS via the DMM GAMES as a free to play title. The game runs via your browser and available only in Japanese.
It should be noted that this game is the official port version of the Rival Arena VS which released on September 29, 2016 on iOS and Android. Until March 1, 2017 in the Start Dash! campaign you can link your PC version game with the smartphone version and you will get the extra amount of gems in both games! (Data Link available only for the same accounts).