A mysterious organisation keeps sending intimidating letters to Fiasse Crystela, the principal of British Crystela Song School. The purpose is to find the whereabouts of Fiasse's inheritance.

Although Fiasse already has a bodyguard, Ellis McGaren, she asks her childhood friends, the brother and sister Takamachi Kyouya and Miyuki for help. As a professional bodyguard, this of course is frowned upon by Ellis.

Kyouya remembers an incident that happened several years ago, when he was about ten years old, aimed at Fiasse's father, senator Albert Crystela. So one wonders, if Fiasse's fate and present situation is related to that past incident?

Source: AnimeNfo

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Alternative setting: Mahou Shoujo Lyrical Nanoha
Prequel: Triangle Heart: Sazanami Joshiryou
Side story: Mahou Shoujo Lyrical Nanoha: Lyrical Omocha Hako