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.
You back off! It's none of your business!
!تراجعا! لا علاقة لكما
Ihr Unbeteiligten
haltet euch da raus!
¡No es asunto suyo!
¡No es cosa vuestra!
Ça vous concerne pas,
alors dégagez !
Non impicciatevi, non sono affari vostri!
Afastem-se! Não é da conta de vocês!
Вас это вообще не касается!