The title (親戚の子とお泊まりだから) roughly translates to "Because I'm Staying Overnight with My Relative's Child" . It refers to a Japanese hentai anime/manga series typically categorized under adult genres rather than mainstream slice-of-life. Series Overview
Japanese Family Members Explained | Kazoku vs Shinseki - TikTok shinseki no ko to o tomari da kara eng
In Japan, overnight stays ( otomari kai – お泊まり会) are common among school friends, cousins, and extended family, especially during summer vacation or New Year’s gatherings. Unlike in some Western countries, Japanese extended families often live nearby, and children frequently stay at grandparents’ or uncles’/aunts’ homes. " Shinseki no Ko to O Tomari da
So the sentence implies: “This overnight stay with a relative’s child is therefore a fated connection.” Unlike in some Western countries, Japanese extended families