Books containing the intense emotions of the author, sometimes with the power to force the death of their readers, these books are known as "cursed tomes". The role of the Imperial Library Intelligence Asset Management Bureau, nicknamed Fukurou, is finding and retrieving these books. As a result of the incident with her brother, Tsugumi has gained the ability to see the auras around cursed tomes and decides to join Fukurou to put her new powers to use. However, she finds Fukurou full of rather unique members such as Ozaki Hayato with a sharp-tongue and a strong sense of justice, Kougami Akira who has difficulty with people, and Hoshikawa Hisui with mismatched eye colors.
Despite his appearance, Mashiko 
is well-versed in various fields.
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Trotz seiner Erscheinung ist Mashiko
eine Koryphäe auf diversen Gebieten.
A pesar de su apariencia,
Mashiko sabe sobre muchas cosas.
A pesar de su apariencia,
Mashiko sabe muchas cosas.
Il est un peu excentrique, mais c’est
un expert de nombreuses cultures.
Nonostante l'apparenza, 
Mashiko è esperto in molti campi.
Apesar das aparências, o Mashiko
é bem versado em diversos campos.
Несмотря на его внешний вид,
Масико — специалист во многих областях.