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.
Also, please be careful 
around Professor Mozuyama.
.أيضًا، احترسي رجاءً من الأستاذ موزوياما
Sei in Professor Mozuyamas
Nähe bitte vorsichtig.
Y por favor, ten cuidado
con el profesor Mozuyama.
Y por favor, ten cuidado
con el profesor Mozuyama.
Et puis,
E mi raccomando, 
fa' attenzione al professor Mozuyama.
Além disso, tenha cuidado
com o Prof. Mozuyama.
И прошу, остерегайся
того профессора Модзуямы.