Where's Keine Bento Box hat?

Oh, here's another without a translation. Would someone do this one too please?

AnimeMaster said:

Where's Keine Bento Box hat?

Looks like Mystia isn't wearing hers either so maybe they have a rule of not wearing hats during class?

Thank you monhan for the translations! As expected, quite hilarious stuff, love Cirno's innocent look while asking the question.