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.
Welcome to the Imperial Library 
Intelligence Asset Management Bureau.
.مرحبًا بك في مكتب استخبارات إدارة أصول المكتبة الإمبراطورية
Willkommen beim
kaiserlichen Bibliotheksgeheimdienst.
Bienvenida a la Agencia de
Inteligencia de la Biblioteca Imperial.
Bienvenida a la Agencia de
Inteligencia de la Biblioteca Imperial.
Bienvenue au bureau de gestion
de la bibliothèque impériale.
Benvenuta alla sede Ufficio di gestione
delle informazioni della Biblioteca Imperiale.
Bem-vinda ao Setor de Gestão de Ativos
de Inteligência da Biblioteca Imperial.
Добро пожаловать в бюро
разведки императорской библиотеки.