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 lived with just my mother 
and my little sister.
كنت أعيش مع أمّي وأختي الصغيرة
Damals lebte ich mit meiner Mutter
und meiner kleinen Schwester zusammen.
Antes vivía con mi mamá
y mi hermana menor.
Antes vivía con mi madre
y mi hermana pequeña.
À l’époque,
Dovete sapere
Eu morava apenas com minha
mãe e minha irmã mais nova.
До старшей школы…
я жила втроём с мамой и младшей сестрой.