They just hired Oliver who can hold full English collabs and went to school as a kid in English, Mayuzumi was raised by someone who knows English so he can read it but not speak well, Naruse knows a good amount of conversational English but for some reason he thinks it's bad when he's better than most in his branch, Genzuki studied in Canada and can hold conversations, HSKW was raised in England, Yashiro can speak some English but mostly geared towards IT, Sukoya knows a good amount of English, and Yumeoi knows English with nice pronunciation (forgot where he learned it from)
Shirayuri Lily knows quite a lot of English.