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.
Thank you for the chocolate you gave me.
شكراً على تلك الشوكولاته
Danke für die Schokolade letztens.
Gracias por los chocolates.
Gracias por los bombones.
Merci pour les chocolats.
Grazie per la cioccolata dell'altro giorno.
Obrigado pelo chocolate que você me deu.
Спасибо за шоколад.