The phrase provided appears to be the title of a Japanese media production. "Shinseki no ko" translates to "a relative's child," and "otomari" refers to "staying overnight."
"Shinseki no Ko to O Tomari Dakara" (親戚の子とお泊りだから), often translated as "Staying Overnight with a Relative's Child," is a visual novel focused on choices that lead to different narrative outcomes. shinseki no ko to o tomari dakara de na %C3%ADn
The phrase (Japanese: 親戚の子とお泊まりだから) translates to "Because I'm staying over with a relative's child". It is the title of a popular Japanese adult anime (hentai) series released in 2023. The phrase provided appears to be the title