In a Japan where the Taisho Era didn't end after 15 years but went on for another 10 additional years the eldest daughter of the financially declining Kuze family, Tsugumi, resolves herself to a marriage she doesn't desire for the sake of her family. However, Hitaki, her younger brother, vehemently opposes the marriage and after a fight with Tsugumi, shuts himself away in his room and attempts to kill himself. Tsugumi blames herself for her brother's suicide, but two mysterious men appear identifying themselves as part of the Imperial Library Intelligence Asset Management Bureau and reveal that her brother's suicide might not be as clear-cut as it seems.
Our primary function at the Imperial Library 
Intelligence Asset Management Bureau
وظيفتنا الأساسية في مكتب استخبارات
إدارة أصول المكتبة الإمبراطورية
Unsere Hauptaufgabe vom
kaiserlichen Bibliotheksgeheimdienst ist es,
Nuestra labor principal en la Agencia de
Inteligencia de la Biblioteca Imperial
Nuestra labor principal en la Agencia de
Inteligencia de la Biblioteca Imperial
L’activité principale du bureau
est de trouver
Lo scopo primario dell'Ufficio di gestione
delle informazioni della Biblioteca Imperiale
A função primária do nosso setor
na Biblioteca Imperial
Наша главная задача в бюро
разведки императорской библиотеки —