: "Maki-chan to Nao" appears to refer to a story, possibly a manga, anime, or light novel, involving characters named Maki and Nao. The nature of their relationship (friendship, romance, familial) and the genre (comedy, drama, fantasy) would depend on the specific work.
The sequels also introduce new characters, such as from "Mayu-san to Nau," a spin-off focusing on a new couple in the same universe. maki chan to nau
Just don’t turn around to check who is sitting on your couch. : "Maki-chan to Nao" appears to refer to