Mynet Game Inc acquired the distribution rights of the Sen no Kaizoku smartphone game from SEGA. SEGA today made the official announcement which means the service provider is Mynet Game Inc. (You can find the game under the SEGA’s license in the AppStore, Google Play and the official website but it will change soon).
The Sen no Kaizoku is a popular smartphone RPG game which released in 2015 August in Japan. Until now the game reached more than 3 million downloads (iOS and Android) and it still has a large player group in Japan. Hope the quality of the service doesn’t change negatively.