Kasumi implying Michishio infected Arashio with her hair buns as proof.
How nice...Huh!?Arashio, I need you to do me a little favor and kick our idiot sister out of my room!Ufufu~
I like to sometimes too, you know~You've gone and spread your cold over to Arashio-neesan, haven't you!!...not great.Michishio-chan, how are you feeling?Suits you, though.What's the occasion for the fancy duds there?Hang on, Michishio-nee!!Thanks~♪A Happy New Year to you!Arashio-neesan!