Takuro's father had borrowed money from black money. When Takuro and Natsu are trying to enjoy their youth in the absence of their father, Ozawa, known as the black-market uncle, arrives. Takuro was nervous in his heart that Natsu would be played a naughty prank on Natsu after he was taken away to cover the debt, but later he defended Natsu saying that nothing was done to him and that Mr. Ozawa was a good person.