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.
She said, "Thanks, Big Sis!" so many times.
قالت لي "شكراً لكِ يا أختي الكبيرة" مراراً وتكراراً
Immer und immer wieder
bedankte sie sich.
Me dio las gracias una y otra vez.
Me dio las gracias una y otra vez.
Elle n’arrêtait pas
de me remercier.
Non faceva che ringraziarmi.
Ela disse "Obrigada, mana!" muitas vezes.
Всё благодарила не переставая.