Turns out the one spreading the rumors was Hashimoto, who did so at the behest of Sakayanagi. Shortly thereafter, Sakayanagi appears before Class C and she informs them she has evidence regarding the rumors about Ichinose.
Any further spreading of rumors would 
breach the school's code of morality.
نشر المزيد من الشائعات سيخرق
مبادئ المدرسة الأخلاقيّة
Diese Gerüchte schaden dem Schulklima.
Esta práctica afectará
a la disciplina de la escuela.
Esta práctica afectará
a la disciplina de la escuela.
Si les ragots persistent,
l’ordre de l’école pourrait être perturbé.
Continuate con queste voci
Qualquer outra disseminação de boatos será
vista como uma violação da política da escola.
Подобное поведение
плохо отражается на репутации школы.