The Weathering Continent

Living on a continent devastated by centuries of environmental calamities; Boice, Tieh, and Lakshi are travelers heading towards Haelle Kine where they hope to obtain water. After encountering a group of people who were recently murdered and a survivor who dies due to fatigue and starvation, they find themselves amid Azec Sistra, a city built for the dead. Legend says that no one has ever left this city alive.

Synopsis from Anime News Network