A mysterious organization keeps sending intimidating letters to Fiasse Christella, the principal of British Christella Music Academy. The purpose is to find the whereabouts of Fiasse`s inheritance.

Although Fiasse already has a bodyguard, Ellis McGaren, she asked her childhood friends, the brother and sister Takamachi Kyoya and Miyuki to help Ellis. This of course is received by Ellis, as a professional bodyguard, with a cold shoulder.

Kyoya remembered an incident that was happened several years ago, when he was about ten years old. This incident was actually aimed at Fiasse`s father, senator Albert Christella. So, does Fiasse`s fate and case related to this past incident?