It is but not for the reasons you think, Enna and Michi/Mika were good friends back when they were both in Niji, so much I'm sure Enna managed to sneak a visit to her one time and that she was one of the last collab partners before her graduation. I am more surprised by the fact Michi followed her publicly rather than doing it at all, as I thought ex-niji livers had to avoid all public contact with old coworkers, maybe it's because she's Ex-ID? or maybe she doesn't give a fuck about it?