Battle Golfer Yui is a Sega Genesis game where Gil Hazard, also known as Professor G, aims for world supremacy using the power of golf through the Dark Hazard organization. High school golf talents, Yui Mizuhara and Ran Ryuzaki, are targeted for his Battle Golfer project. However, a sudden rescue prevents them from falling into his control. Sensing clandestine intentions behind a golf tournament organized by the Hazard Foundation, Yui enters secretly to confront Professor G.
Gil Hazard, president of the Hazard Foundation, is secretly Professor G, the leader of the evil Dark Hazard organization. He has designs on world domination, and has plans to use the power of golf toward this end; this is the Battle Golfer project. Yui Mizuhara and Ran Ryuzaki are two ordinary high school girls who just so happen to be golf prodigies, and so are prime candidates for the Battle Golfer project. They are abducted by Professor G, but are rescued by a mysterious man before they can be taken under his control.
Having escaped, Yui hears about a golf tournament being held by the Hazard Foundation, and suspecting more nefarious plans, she secretly enters the tournament to stop him for good.