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 believe that we at Fukurou have a duty
to oversee what cannot be judged by laws.
أعتقد أنّنا في فوكورو نملك واجبًا
.بالإشراف على ما لا يمكن للقوانين حكمه
Die Pflicht meiner Fukurou ist,
Nosotros en Fukurou
tenemos el deber de vigilar
Nosotros en Fukurou
tenemos el deber de vigilar
Je pense qu’il est de notre devoir,
nous, les Hiboux,
Credo che la Fukurou abbia il dovere di vigilare
 su ciò che non può essere giudicato dalla legge.
Na Fukuro, temos o dever de supervisionar
o que não pode ser julgado pelas leis.
Я считаю, что наше Фукуро обязано следить
за всем, что нельзя судить по законам.