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.
Being able to write a book
at all is rare in and of itself.
.أن تكون قادرة على كتابة كتابٍ لهو نادر بالتأكيد
Darüber ein Buch zu schreiben,
ist daher eher ungewöhnlich.
Poder escribir un libro es raro de base.
Poder escribir un libro
es raro de por sí.
C’est déjà rare en soi,
qu’une d’elles puisse écrire un livre.
Già essere in grado 
di scrivere un libro è cosa rara.
Ser capaz de escrever um
livro, por si só, é algo raro.
Возможность писать книгу
сама по себе редкость.