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...