"Futaba AV de midv64 new" is more confusing. "Futaba" could refer to other VTubers named Futaba, but Sara is the main one here. "AV" usually stands for adult video, but in this context, it might be a mistake or another abbreviation. "midv64" doesn't seem to be a standard term, but "V64" could relate to a version or number. Maybe it's a mistranslation or misspelling.