From MangaHelpers:

After his retirement, four time junior feather weight world champion of boxing Hanaoka Ken opened up a restaurant. But his business was hemorrhaging money from the lack of customers and Ken was looking for ways of bringing life back into his dying business. He meets a celebrity muilti-millionaire chairman and learns the absolute basic but crucial fundamentals of operating a business. The chairman, who acknowledges Ken’s determination, talent and luck decides to invest $1 million in Ken. With that amount of capital, Ken can start any business. He will bring the same passion and philosophy that took him to the top of the boxing world to the business world. [vyc]