Tyranno, a large carnivorous dinosaur of the Ceratosaurus species (though frequently misidentified as a Tyrannosaurus in promotional materials), lives isolated from others due to his refusal to eat meat—a choice conflicting with his predatory biology and fueling profound internal conflict and loneliness. His solitary existence shifts when he saves Punon, a flightless young Pteranodon orphan, from carnivorous dinosaurs. The pair forms an unlikely bond, with Tyranno assuming a protective, parental role and dedicating himself to Punon's safety and well-being.

Driven by a shared desire for belonging and safety, Tyranno and Punon journey across perilous landscapes seeking an "earthly paradise"—a refuge free from fear or conflict. Their quest is persistently threatened by Gorgo, a dangerous albino Gorgosaurus leading a pack of predatory dinosaurs. Gorgo's relentless pursuit forces repeated confrontations, testing Tyranno's resolve and protective instincts.

Tyranno's character evolves from isolation to forging a familial bond with Punon. He consistently prioritizes her safety, often risking himself to shield her. This culminates in a climactic confrontation where Tyranno makes significant personal sacrifices to ensure Punon's survival against Gorgo and his pack. The journey reinforces themes of found family and perseverance through loss. Their relationship, built on mutual dependence and care, becomes the emotional core of their experiences, defining Tyranno as both guardian and companion.