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.
But I'd appreciate it if you'd 
stop suspecting us for no reason.
لكنّي أتمنّى أن تتوقّفوا عن
الاشتباه بنا بلا مسوّغ
Pero dejen de acusarme imprudentemente.
Pero dejad de acusarme imprudentemente.
mi farebbe piacere se smetteste di essere
così sfrontati da sospettare subito di noi.
Mas eu agradeceria se parassem
de suspeitar de nós sem motivo.
Разве что… будьте добры,
впредь избавьте нас от пустых обвинений.