Anata Dake Konbanwa Episode 3

One day, Anna goes missing. Riko, her older sister, looks for her, but she doesn’t know where Anna has gone…. Days later, Riko meets a woman in the town. Her name is Naomi, whose fiance is also missing after he entered a self enlightenment group

The Kameyama family and the Otori family are relatives. They are both trying to compete for control over Otori Academy. Violent crimes are happening inside the academy. There are rumors that someone wearing an iron mask is assaulting female students inside