Tsugumi,agrees to marry to save her family from ruin, but her younger brother despises the marriage and after they argue he shuts himself away in his room and starts himself on fire.

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.

Sagisawa Rui, who had a precious book stolen and burned by a group called Kagutsuchi, asks Tsugumi for help.

Having nearly killed himself due to the influence of a cursed tome, the Prime Minister's son comes to live at Fukurou in order to recover.

When a number of female murder victims are discovered in Ueno Park with lilac flowers in their mouths and one of Shizuru's books by their side, rumor spreads that he may have some involvement in the case.