In an extended Taishou era lasting 25 years, a girl decides to marry a stranger to safeguard her declining family. Before the wedding, her brother tragically self-immolates clutching a mysterious tome. Enter the enigmatic “Imperial Library Intelligence Asset Management Bureau,” known as “Fukurou,” revealing the existence of potent books called “Maremono” that influence readers profoundly. After this tragedy, the girl acquires the ability to perceive “Auras,” the emotions emanating from Maremono as radiant lights invisible to most. Amidst this turmoil, she dares to step beyond her confines, encountering a tapestry of emotions like jealousy, hatred, and love. As she navigates a web of betrayal ensnaring the imperial capital, will she unravel the truth or succumb to the darkness that entwines her fate?