The continent of Yggdra (ユグド, Yugudo) is a place where humans, ogres, giants, forest sprites, and many more mythical creatures live. Led by the Holy King, the continent was at peace until one day, a mysterious group called the Black Army (黒の軍勢, Kuro no Gunzei?) appeared and started conquering the land. In response, the Holy King and its troops fought against it, but Holy Capital fell and the Holy King was killed by the mysterious Black King. As the continent was in the glimpse of destruction, hope glimmered as one man, you, the Hero, decided to fight back and formed the Volunteer Army to oppose the Black King and bring peace back to Yggdra.

Chain Chronicle (Japanese: チェインクロニクル, Hepburn: Chein Kuronikuru?) is a tower defense role-playing game developed and published by Sega for iOS, Android, and PlayStation Vita. It was released in Japan on July 26, 2013 for iOS, August 1, 2013 for Android and on July 16, 2014 for the PlayStation Vita. The game is licensed in Asia by SNDA in China, MobiMon for both Taiwan and Macau, Actoz Soft for South Korea and gumi Asia for both Southeast Asia and North American release, however the game was closed down in February 29, 2016.

The series spawned an original video animation series directed by Takeshi Mori, animated by Jūmonji and Sotsu. It was released on December 18, 2014. Another anime titled Chain Chronicle: The Light of Haecceitas is also confirmed to be in development.