Seisen Cerberus

 is a Japanese role-playing mobile game released by GREE. The series has been adapted separately into both a manga, titled , and an anime television series, titled . The manga was published by Kodansha in 2013, while the anime aired in 2016.
Plot.
On the continent Kunaaan, there are three kingdoms, Saint Amoria, Ishilfeen and Vanlodis, with a fragile power balance that could spell disaster and war at any moment. The evil dragon Daganzord also resides on the continent and no one is powerful enough to stop him from spreading destruction and charred land in his wake. Bairo, Kismitete, and a party of wizards attempted to seal Daganzord, but were foiled and this event was known as the Balbagoa Tragedy. Hiiro, Bairo and Kismitete's son, is saved by Giiru and swears to avenge his parents death by training himself with the sword. After turning sixteen Hiiro, with Giruu accompanying him, sets out on a journey to slay the dragon. Along the way, they meet many types of people and gain companions on their journey.
Media.
Game.
Game producer GREE released the role-playing card battle game as a mobile game in 2011.
Manga.
A manga adaptation by Seijirō Narumi launched in Kodansha's "Bessatsu Shōnen Magazine" in April 2013 and ran until November 2013. The series was collected into two "tankōbon" volumes.
Anime.
The game received an anime television adaptation to celebrate its fifth anniversary. The series is directed by Nobuhiro Kondo and written by Hiroshi Ōnogi, with animation by the studio Bridge. Character designs for the series are provided by Gō Tōgetsu, and Noboru Haraguchi served as the sound director at Tohokushinsha Film. Hideakira Kimura and Nobuaki Nobusawa provided the anime's music.
The opening theme song is "Resonant Heart" by Maaya Uchida, while the closing theme is "Xenotopia" by Suzuko Mimori.
The series premiered on 4 April 2016, and was broadcast on TV Tokyo, TV Osaka, TV Aichi, and AT-X. It was streamed on iQIYI, which co-produced the series. The series was simulcast by Crunchyroll under the title "Cerberus".