There was also a drinking stream Mika and Enna did, and one of the questions was about your first impression. In Mika's words she was very afraid to even contact them, because she thought if she says one wrong thing they will immediately start bullying her and make her life hell in the company, due to how close Enna and Millie are to each other. Which doesn't mean much as it was just an impression, not a result of ongoing engagement but still.