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 you used Kamuro to drag me into it.
لكنّكِ استغللتِ كامورو لإقحامي
Doch du hast mich durch Kamuro
mit reingezogen.
Pero me involucraste usando a Kamuro.
Pero me involucraste usando a Kamuro.
Mais tu t’es servie de Kamuro
pour m’y mêler.
Invece hai mandato Kamuro 
e mi hai coinvolto.
Mas você usou a Kamuro
para me arrastar nisso.
Но ты решила впутать меня
 с помощью Комуро.