For thousands of years, tigers from the small kingdom of Bengardia went to the Green Corridor for malachite grass. But after an invisible enemy destroyed the Bengardian people, difficult times came for the whole world: after all, without malachite grass it is impossible to create familiars or fly to a neighboring planet. And now a detachment led by Doctor Tsingulon, a brilliant felycephalic lion, is looking for a semi-artifex - the only hope of obtaining such a valuable resource. Meanwhile, a young cinecephalus named Astra, a naive and dreamy wolf cub, is worried about something else: he is fired from his job. If only he knew how one chance acquaintance would turn his life around and change the destinies of others...