Lenny is a young adventurer, who has a date with Charles. both come in their steamobile, near the luminous forest.

Meanwhile, in the neighboring city, Rodolphe, a young apprentice time traveler, searches for his missing master among the vegetables.

the latter is in fact in a parallel reality, where he is looking for his student Rodolphe.

To be reunited again, they will have to discover an ancient city in which there is a portal of blue light.