The Taishou era didn’t end in 15 years, but went on for another 25. 

In order to protect her waning family, a girl resolves to marry a man she doesn’t even know the name of. However, just before the marriage was to take place, the girl’s younger brother mysteriously committed suicide by self-immolation and was found holding an old book in his hands. 

Appearing before the bewildered young girl was the “Imperial Library Intelligence Asset Management Bureau”- more commonly referred to as “Fukurou”. 

According to these men, there exists “Maremono”, which are books that greatly affects its readers. On top of that, ever since the incident involving the girl’s younger brother, she unwittingly gains the ability to see “Auras” (the sentiments of the Maremono which manifest as bright lights and are usually invisible to humans). It was as though fate were trying to drag the young girl in its flames. 

And then, even though apprehensive, the girl chooses to venture outside her bird cage. 

Jealousy, hatred, scorn, compassion and love.
What awaited the girl was the darkness of betrayal that had already begun to bewitchingly inlay the imperial capital. 

Toyed by and swayed within that darkness, will the young girl finally reach the truth after her struggles, or…? 

(Source: VNDB)

The story is set in the Taisho Era at the beginning of the 20th century—except the era did not end in 15 years (as it did in real life) but lasted 25 years. To protect her family who fell from their former glory, a girl decides to marry a man whose name she does not even know. However, before she does, her little brother commits suicide in a mysterious fire, with an old book in hand. 
The Imperial Library Information Assets Management Bureau—also known as "Fukurou"—then appears before the confused girl. 
According to the Fukurou, there exists books called Maremono, which exert a great influence on those who read it. Moreover, the girl gained the ability to see an "Aura" due to the incident with her brother. Despite her confusion, the girl chooses to leave the "birdcage" of her former life.
 
(Source: Anime News Network)

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