Put together, the original Japanese phrase means something along the lines of: "Because I am having a sleepover with my relative's child..."
Yoshida, a 26-year-old office worker, finds a 17-year-old high school girl, Sayu, sitting on a street corner. She has run away from home and offers sex in exchange for a place to stay. Yoshida refuses the sex but lets her sleep on his couch. shinseki no ko to o tomari da kara english dub
Let's break down the information: