mechanical buddy universe
Post-apocalyptic science fiction setting by Ishiyumi (AKA Katou Takuji). Most stories in the setting generally involve a human paired off with a sapient robot character as their primary protagonists.
Four main stories are set in this universe:
In addition there is the Apparition story which technically takes in the same universe.
Currently serialized by Square Enix as Mechanical Buddy Universe 1.0.