Spirou and Fantasio had to create a diversion for the triangle back to Europe, while Itoh Kata was himself on his way with the "Kuko Jomon" mushroom. Once both are secured in Champignac, the Count and Itoh manage to make the cheapest car fuel out of the kuko jomon, for Noémie (an old car). All it needs to react and work is a sugar lump. Once again, the triangle tries to put their hands on Noémie. This story is followed by a short one, Faux départ ("False start").
Tropes associated with this story include:
- The Family for the Whole Family: The Triangle, an evil secret organization with three bosses, and a Take Over the World goal.
- You Are Number 6: Members of the Triangle refer to themselves by number according to their rank in their hierarchy.
