قسمت 45: بلک جک هم‌کلاسی سابقش را درمان می‌کند که پس از حمله مافیا توانایی خندیدن خود را از دست داده است.

45

In this episode, we take a glimpse into Black Jack's childhood. Kuro Hazama's classmate from middle school, Gerra, loves to laugh. Kuro asks him why he laughs so much and his classmate says it is because he likes being happy and bringing joy to other people. Gerra then tries to encourage Kuro to laugh too. When Kuro visits Gerra's house, he learns that Gerra's parents abandoned him because they couldn't pay their debt. Then goons from the mafia came to his house and stabs Gerra in the neck with a dart. His injury was so severe that Gerra could never laugh again. Kuro promises to be a doctor so that he can cure him. When he comes to check on his friend during his college years, he finds him bedridden and still unable to laugh. Black Jack operates on him and it is successful, until he receives a call informing him that his former classmate has just died laughing. (Source: Wikipedia)