The story begins with Kylie, who, with the help of Sam, came up with a fun idea to set up a marathon event in a 'lucky' volunteer city. What's the marathon about? To see which Giantesses can cause the most mythem... and which tinies will not get smushed! You play as one of the rampaging Giantesses, where the goal is to smush tinies to steal their size and grow enormous, smashing every building in your sight before the timer expires.