The main characteristics include intense chase scenes, a sense of helplessness for the victim, and a build-up of tension as the stalker gets closer. It might also have elements of mystery as to the stalker's identity and background.
The manga 'Stalker X Stalker' and its adaptations could have similar themes and key events. However, adaptations might tweak the character designs or add more visual effects to make it more appealing for the medium. Sometimes, they might even expand on backstories that weren't explored in the manga.
The ending of Girlfriend Girlfriend manga is quite complex and bittersweet. The characters go through various challenges and their relationships evolve in unexpected ways.
Renting a girlfriend in manga can happen in different ways. It could be a character responding to an advertisement, or getting involved in a strange pact. The details and mechanics usually depend on the unique world and story that the manga builds.