So the full title might be trying to say: "Sleepover with a Relative’s Child" is the exclusive name.
It seems you are looking for an explanation or a summary regarding the title or concept surrounding (often associated with the English title My Cousin's Kid and I or similar variations) and the specific phrase you included, "es el nombre exclusive." shinseki no ko to o tomari es is el nombre exclusive
The series gained notice within niche online communities and social media platforms like Instagram and TikTok , where short clips or "reels" are frequently shared by anime enthusiasts. It is categorized under adult content ("hanime") rather than mainstream television anime. So the full title might be trying to