Seito Kaichou Hikaru ,Student Council President Hikaru ,聖徒会長ヒカル – St Marris Academy is a facility training youma-hunters. Within their ranks are 3 elite students, Hikaru, Seira, and Yuki. A fierce battle unfolds when the youma Balmus invades the campus. However, the three are defeated when they are attacked by Kotone, a teacher at the Academy subjugated by the youma.