I ask a friend and they were doing an experiment since Shiraishi is sick Yamada and Shiraishi switch and Yamada keeps switching with the other members if the sickness only affects the body even though they change they can still feel the fever or whatever + the last part was good Shiraishi said that reason why she went to school even though she's sick is because she doesn't want to be alone then yamada said it's ok not to attend school since he's gonna be by her side if she's sick MAJOR LOVE POINTS!!!!