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.
I have committed a crime.
أقدمت على جريمة
Cometí un crimen.
Cometí un crimen.
in passato mi sono macchiata di un crimine.
Eu cometi um crime.
Я действительно совершила преступление.
ฉันเคยกระทำความผิด