She genuinely meant no harm by saying that. She only knew that during Youying's intensive training some time ago, he would lock himself in his room every night to work on something. She assumed it was Youying's own preparation for this duel, though she truly didn't know the specific details of this card.
It was only when she leaned over just now and secretly glanced at the card that she began to understand why Ei had been silent for so long.
Afterward, Yae Miko quietly retreated to the side, deciding that if Ei's composure broke, she would still need to find a way to intervene slightly.
Chapter 39