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.
I want you to remember this. 
As long as you do not betray me,
.أريدك أن تذكري هذا
،ما دمت لا تخونينني
Merken Sie sich nur eines:
Solange Sie mich nicht verraten,
Quiero que recuerdes esto:
mientras no me traiciones,
Quiero que recuerdes esto:
mientras no me traiciones,
Mais n’oublie pas ceci,
Voglio che tu tenga in mente una cosa.
Eu quero que se lembre.
Enquanto não me trair,
Хочу, чтобы вы запомнили.
Пока не предаёте меня,