2008 film by Agnès Merlet

Brothers Martin and Simon, not yet teens, are incorrigible vandals; Martin runs away from reform school, Simon from foster homes, and they always find each other in a seacoast town of Lignan, where their destructive behavior is infamous. (It may date to their mother's leaving the family.) Martin is philosophical, romantic, and poetic: he dreams of being the son of a shark; he holds tight to a book about goldfish his mother gave him. In both halting and wild ways, he tries to court Marie, a neighbor girl. Simon, with a pocketknife and an intractable will, seems more dangerous to others. What, on earth, is there for these children-becoming-men? - IMDb

1997 film by Agnès Merlet

The elder one of each generation in the Furlong family is equipped with an extraordinary capacity. James discovers the nature of his at the time of an accident which causes the death of his father and his grandmother. Haunted by this mysterious evil he hides in a forest not to harm anybody. A few years later, Mae also takes refuge it in the forest and meets James.