However, assuming you are referring to Shin Sekai no Ko to Otomari (The Girl in the New Century) or a similar title, here is some information.
If you're looking for where to track this series or read reviews, you can check its status on MyAnimeList or look for clips on using the specific title variations. detailed breakdown of the plot twists or recommendations for similar psychological thrillers shinseki no ko to o tomari da kara mal
If the user intended something like: ( shinseki no ko to otomari da kara, warui — “Because I’m staying overnight with a relative’s child, it’s bad/awkward”), here is a long article on that topic. However, assuming you are referring to Shin Sekai