It’s the end of a forbidden love affair – unless it’s just the beginning. Jo Vieira, aged 20, can’t live without Fanfan, his twin sister. Oppressed by her brother’s overbearing need, she decides to head for the south of Portugal, the country of their parents. Jo’s dreams are shattered; he feels deeply betrayed by his sister.
Caught between his father who is preparing to retire to Portugal and his mother who refuses to leave France, Jo tries to work out his own identity. His passion for rock music gets him involved with his sister’s former lover. By following this charismatic leader preaching dubious ideology, Jo risks losing his “gentle half” forever. Meanwhile in Portugal, Fanfan becomes disillusioned. Will they manage to grow up without each other?