How Did My Little General Store Start Making Hundreds of Billions?!

There's no such thing as a business that's too hard to run. Even a general store can bring in hundreds of billions! After my girlfriend betrays me, her lover provokes me, and my boss ostracizes me, I beat up the homewrecker, kick my trashy ex to the curb, and give my boss a good thrashing. Then I quit, take to the sea, and start with a general store, building a business empire worth hundreds of billions one step at a time! I'll make my rivals tremble at my feet and beg for mercy!