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.
Why don't you say anything to me?
لمَ لا تقول شيئاً لي؟
Warum sagst du nie was zu mir?
¿Por qué no dices nada?
¿Por qué no dices nada?
Pourquoi tu ne me dis rien ?
Perché
Por que você não me diz nada?
Почему… ты мне
совсем ничего не говоришь?