The title includes “relative’s child” — depending on the story, this may involve that some readers find uncomfortable. Always check:
(親戚の子とお泊まりだから) is a niche Japanese manga/doujinshi series. The title roughly translates to:
: For an "extra quality" experience:
The school believes its graduates are failing to integrate into modern society because they are too "innocent." Kimito’s job is to serve as a "Commoner Sample,"