Naomi Sakamoto (坂本直美) is an adult woman with purple eyes and shoulder-length hair in blonde or orange tones. She is a mother facing criticism from educational authorities, who blame her perceived negative influence for her son's behavioral issues at school, including defiance and verbal disrespect toward teachers.

Accompanied by two other mothers, Naomi arrives for a parent-teacher conference about her son's conduct. At the school entrance, two men inform them the building is closed and redirect the group to an abandoned school under false pretenses of relocating the meeting. Naomi instantly distrusts one man, Shigezo, judging him as shady and disreputable.

During the confrontation at the abandoned location, Naomi actively resists the men's actions. Her psychological state is complicated by underlying personal struggles, including implied sexual neglect within her marriage, which fuels her reactions throughout the ordeal.