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.
I'm Tokimiya Shiori of the Imperial Library 
Intelligence Asset Management Bureau.
أنا توكيميا شيوري من مكتب استخبارات
.إدارة أصول المكتبة الإمبراطورية
Ich bin Tokimiya Shiori vom
kaiserlichen Bibliotheksgeheimdienst.
Soy Shiori Tokimiya, de la Agencia de
Inteligencia de la Biblioteca Imperial.
Soy Shiori Tokimiya, de la Agencia de
Inteligencia de la Biblioteca Imperial.
C’est Shiori Tokimiya, du bureau
de gestion de la bibliothèque impériale.
Sno Shiori Tokimiya dell'Ufficio di gestione
delle informazioni della Biblioteca Imperiale.
Sou Shiori Tokimiya, da Gestão de Ativos
de Inteligência da Biblioteca Imperial.
Я Сиори Токимия из бюро
разведки императорской библиотеки.