Plot: Seisen Cerberus is a Japanese role-playing mobile game released by GREE. The series has been adapted separately into both a manga, titled Seisen Cerberus: Mō Hitori no Eiyū, and an anime television series, titled Seisen Cerberus: Ryūkoku no Fatalite. Wikipedia
Plot: Leviathan ~The Last Defense~ is a Japanese mobile game by GREE. The plot features anthropomorphized dragons as characters. It is a freemium game, as the base game is free of charge but game add-ons can be downloaded for various prices. The game was announced in October 2012 and users who preregistered...
Plot: Tanken Driland is a Japanese mobile game developed by GREE, Inc.. A manga adaptation began serialization in Jump Square in 2012. An anime series by Toei Animation began airing on 7 July 2012. Wikipedia