A brother writes to his sister. A brother loves his sister. is it true that one can keep a young woman through writing? The ambition is great. A long correspondence of 149 letters, this film is based on the letters that my brother Didier wrote to me. Two actors carry his poetic writing to a new perception. Axel Bogousslavsky and Nathalie Richard are the brother and sister. They sing, they dance on the roads, on a journey, in the land of « Didierlangue ».A crazy bet, yes, funny, delirious, that of a fable, where the French language is shaken up.This film explores how writing and the experience of a hybrid language create a film about love.