Casshern Sins, Shoujo Shuumatsu Ryokou Recommendations
The biggest similarity here is the world. They are very bleak and grey and they feel as important as the main characters. Both focus on trying to understand something about the past history of the world and simply trying to survive in hostile conditions.
Built on a backbone of an apocalyptic world and slow pacing, both of these series focus on the nature and purpose of being, and what it is to be alive when everything is dying or dead. Casshern is a bit more action and story focused, while SSR is more episodic, but each takes its own methodical look at the world through symbolism and background imagery, as well as poignant character interaction.
Both shows are dark, philosophical, and set at the end of the world. The main characters of both shows meet different people along the way and learn their stories. Casshern Sins is more dramatic and has action, and it doesn't have cute character designs like Girls' Last Tour. However, the atmospheres of the two shows are similar.
They both have the same feel although Casshern Sins has some action. both have nearly tye same setting with Casshern Sins is a little more post apocalyptic and has more survivors then girls last tour. overall if your looking for a show with the same setting, pacing and overall feeling of Girls Last Tour then i would watch Casshern Sins.