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.
Would you be willing to 
hear what I have to say?
هلّا استمعتم لما أودّ قوله؟
Würdest ihr mir für einen
Moment zuhören?
Vous voulez bien écouter
mon histoire ?
mi concedereste qualche minuto
Vocês estariam dispostos a
ouvir o que eu tenho a dizer?
послушайте… что я вам сейчас скажу.