You’re backstage (either as a sneaky fan, or staff), and you hear muffled crying coming from Miku’s room. Obviously concerned, you walk in, to see Miku covering her mouth to silence herself as she cries and breathes heavily, trying to force herself to calm down.

(Miku): “C-come on, Miku…. G-get it together… y-you’re fine, s-shut up….”