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.
The minute we got home, my mother started 
crying, like a dam had burst inside her.
لحظة عودتنا للبيت، أجهشت أمّي بالبكاء
كما لو أنّ حاجزاً سقط داخلها
Zu Hause brach meine Mutter in Tränen aus,
als wäre etwas in ihr zerbrochen.
Al volver a casa,
Al volver a casa,
Une fois à la maison,
Una volta a casa, mamma
Assim que chegamos em casa,
Когда мы вернулись домой…
мама упала и разрыдалась.