An inquisitive beauty who joins the Classic Literature Club. Eru's catchphrase is "I'm curious!" Although she earns top grades in academics, she is often ditzy and relies on Oreki's reasoning abilities often. She is an energetic girl that is well-versed in the town traditions and etiquette, having come from a lineage of wealthy farmers. Whenever a mystery is brought to her, she won't be able to stop thinking about it until it is solved. She holds great admiration for Oreki, often praising him for his talent in solving mysteries. It is hinted that she harbors feelings for Oreki.