The phrase you provided translates from Japanese to: "Because I'm staying over with my relative's kid, I won't be online [or won't answer the phone]. Updated."

Shinseki no Ko to Otomari Dakara de na wa: Latest Updates and Series Guide

Kaito settled into his own futon, his laptop screen the only light in the room. Just as he was about to start a movie, a soft scritch-scratch sound came from the hallway. He froze. He looked at Satoshi. The boy hadn't moved.

For English-speaking fans, the "update" usually refers to the English Scanlation or Subbed versions. Recently, several groups have updated the translations to be more accurate to the original Japanese nuances, replacing older, "rough" fansubs. Why is it Trending?

While specific version numbers may vary by platform (such as DLsite or FANZA), the "UPD" (Update) generally focuses on: