Eurika Ahri is a teenage girl who lived in a place of Fhantalia. All her life she was training for herself to be an S Class creature someday. With her friends who are supported by her dreams, they manage to enroll in a prestigious school in Crisstalia where Clash of Creatures was happening there every year. While staying in that place she felt a tremendous feeling of uncovering the mystery behind the school and the people that surround her.