In the Ketchup Kingdom, where liking tomatoes is mandatory, Tomato Adventure 's protagonist DeMille is shunned by his peers for being an outcast who refuses to condone the culinary norm. This disdain for tomatoes has landed him in a precarious situation – if caught, he'll be locked away until he changes his mind about the red sauce. Things take a drastic turn when DeMille's girlfriend, Patharan, is kidnapped by King Abīra, and now it's up to DeMille to embark on a perilous quest to rescue her.
Tomato Adventure is an action-command RPG where the player must battle enemies that barge into view. Combat takes the form of mini-games using toy-like Gimmicks – these whimsical weapons require precise timing, speed, and input to triumph over foes. With a diverse arsenal of Gimmicks at his disposal, including Time, Speed, Excite, and Input, DeMille must navigate these challenges to emerge victorious in each encounter. Failure is not an option, as the player will be forced to restart from scratch.