There is no Cure for Lovesickness - S1.E11

Seiran and the rest of the household watch over Shuurei after she catches a bad cold while chasing a troublesome student. Reishin Kou continues to conceal from Shuurei that he is her uncle. Reishin fears that if Shuurei knew his identity, she would hate him as the man who took her father's place as head of the Kou clan.