While out on their rounds one day, Tsugumi and Hisui learn of the existance of a book written by a prostitute from Yokohama's redlight district. Hisui seems especially desperate to get his hands on this book and when Tsugumi learns the reason why she becomes determined to help him. When Tsugumi discovers that Shiginuma Shouko, wife of the shady owner of the Nachtigal dance hall, she finds herself stepping back into potentially dangerous territory alone.
So why? Why would you 
do something so risky?
لكن لماذا؟ لمَ قد تقومين بشيء خطير كهذا؟
Aber wieso? Wieso würdest du
deinen Hals für mich riskieren?
Pero ¿por qué? ¿Por qué harías
algo tan arriesgado?
Pero ¿por qué? ¿Por qué harías
algo tan arriesgado?
Alors pourquoi ?
Però, perché?
Mas por quê? Por que
faria algo tão perigoso?
Но почему? Зачем ты так рисковала?