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.
How about it? Would you care 
to come visit my laboratory?
ما رأيك؟ هل ستأتين للّعب في مختبري؟
Wie wär’s? Würdet ihr
gerne in meinem Labor spielen?
¿Qué pasa? ¿Quieres venir
a jugar a mi laboratorio?
¿Qué pasa? ¿Quieres venir
a jugar a mi laboratorio?
Que diriez-vous de venir vous amuser
dans mon laboratoire ?
Che ne dici...
O que acha? Quer vir
brincar no meu laboratório?
Ну что? Не хочешь заглянуть
в мою лабораторию?