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 think my mother knew I'd stolen it.
أعتقد أنّ أمّي عرفت سرقتي له
Meine Mutter wusste,
dass ich sie gestohlen hatte.
Mi mamá supo que la había robado.
Mi madre supo que lo había robado.
Maman a tout de suite compris
que je l’avais volée,
Mamma ha capito subito
Acho que minha mãe sabia
que eu o havia roubado.
А мама… поняла,
как я раздобыла заколку.
ดูเหมือนคุณแม่เขาจะรู้อยู่แล้วว่าฉันเป็นคนขโมยมา