Jealousy Vol. 3 (manga)

The prequel to the popular yakuza rom-com Fourth Generation Head: Tatsuyuki Oyamato!

A yakuza head finds himself ensnared in the unwavering attentions of a sometimes impetuous but always cunning schemer. If being yakuza doesn't get him killed, his new lover just might!

To earn the trust of his beloved yakuza boss, Uichi finds quick success with the stock market trading Akitora has asked him to do for the family. But this gives Akitora's right-hand man, Asoda, dark feelings of envy toward his childhood friend. Of course, not everything can continue coming up roses for Uichi, and he soon discovers a mistake in his stock account that leaves him deep in debt!