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.
I'll have to report to the former president
فسيتعيّن عليّ إخبار الرئيس السابق
werde ich dem Ex-Vorsitzenden berichten,
tendré que informarle
al anterior presidente
tendré que informar
al anterior presidente
je devrai rapporter
à l’ex-président
sarebbe un chiaro segnale per l'ex presidente
terei de informar ao ex-presidente
и я сообщу бывшему председателю,