Five kids wake up in a world where everybody has disappeared.

Year 2065. Convinced sex was better in the old days, a group of teenagers set out on the trail of Retrosex.

A few hours in Paris, one summer evening in 2020. The camera follows one passer-by then the other, traveling through the streets of the city and multiplying curious encounters: eccentric young people, original characters and nonconformists. During a single uninterrupted shot, the camera links the characters together through the same city, and the same time in crisis that each one goes through and questions in their own way.

Matt, a charismatic coach, captivates crowds until he spirals into a disturbing downward spiral.