Alternatively just keep beating Mr.Shakedown for money. Eventually he’ll be carrying near 1 billion yen as you get to the later chapters, by then, the real estate or hostess club don’t offer near enough money but you do unlock two new styles from them, the best in the game for both characters and the styles they use…

Yeah the article writer probably hasn’t played far into the game to master the other styles or see how they all offer different benefits. Good luck to him fighting Mr.Shakedown with the slugger style, where after you finish performing a move, you’re open to attack.