The player takes the role of a penguin named Penta, who is getting dumped by his girlfriend Penko because he has become far too obese for her liking. Penta originally appeared in Antarctic Adventure and Penguin Adventure, and he is the father of "Pentarou" who appeared in the Parodius series. The game follows Penta's quest to win back his ex-girlfriend by losing weight via collecting diet drinks and avoiding enemies. Penko's new boyfriend, Ginji, is trying to block Penta's attempt by dispatching enemies sent to force-feed him back to obesity.