You know, I'd assumed the third was Mari, but that doesn't make sense. This person uses "chan" with Kanan and "san" with Dia, and that sounds like Chika or You to me. I guess that speech bubble counts as orange, so Chika it is.
@kickap00
I would like to think that they lost on the King's Game and have to do the dare since both of them looks troubled and didn't know what to do about it