Sunomiya Sae

After her mother was invited to "the family" when Sae was young, Sae's household collapsed. Her brother took his own life, leaving behind the words, "Don’t be killed by righteousness." As a result, Sae has come to hate her mother, "the family", and all related "families", trying to escape this environment on her own. She is engaged to Itsuki and was informed of this relationship a year earlier than Itsuki, but had no intention of accepting it —- until she happened to meet Itsuki.