Where there are more people, there is more suffering…
The Age of Temmei. Edo, Yoshiwara district.
The secret organization "Kokuun"…
Commoners do not know that its main residence was located in the very heart of the Tokugawa shogunate, in one of the best brothels in the city — "Kuroba-ya".
Ruri — the most famous and top-class courtesan, the fourth chapter of "Kokuun". During the day, she entertains clients, and at night she destroys the demons that have overrun Edo.
Armed with an enchanted sword, enjoying the freedom and power bestowed upon her, she determines the fates of those who died with deep grievances in their hearts. Rich clients, friendly friends, and treacherous demons… They all somehow gravitate towards her…
However, the girl is forced to fight not only with the undead: she is afraid of her own extraordinary power.
One day, her best friend disappears…