Maika Sakuranomiya was using Mouth Mask Too.

Maika: Miu-san, you was suffering cough, so it will affects to all of us if we not wearing a mouth mask. Miu: Yeah. It seems if i wearing a mouth mask, my Cough can relieved and will return to normal gradually. Maika: I think all Blend-S must wearing a mouth mask at some time so our family will not suffer coughing like this. Miu: That's true. Just, tell to others okay. Maika: Alright! Stay strong, Miu! (^_^)