NieR Re[in]carnation: The People and the World

The denizens of a wide variety of worlds are gathered in a vast expanse known as The Cage. Perplexed, they are greeted by a mysterious creature that introduces itself as Mama. Despite having only just made their acquaintance, Mama asks the group for their help, claiming the world requires protection from external forces that would see The Cage destroyed. To stop the invasion, the group proceeds along a path without end, and each among them is made to confront their own concealed truth.