NieR

Drakengard Connection

Although the game never explicitly states it as such, NieR is a sequel to a previous cavia game, Drakengard. NieR takes place in the far future of the same world which Caim and the red dragon are sucked into in the final hidden ending of Drakengard. There are several references in the game as well, such as Nier collecting many of Caim's former weapons, a tree that mentions a memory of a red dragon falling from the heavens, and the twins Devola and Popola being named after the sword Debolpopol (Skald's Song in the English translation).