Like Damien, Stephen Macouzet, the "new" school student, is bullied by Ugolino and his gang. Especially in December, just before the Christmas holidays he thought finally celebrate quietly with his father and mother. But the challenge Hugolin leaves him no choice but to show reckless. A hellish descent into the sled both lead to the lair of Mimi mad. So begins an adventure that takes the protagonists in the past.