Kasino is a youth comedy based on true stories told by a wide range of people about the time when mobile phones first appeared in the hands of young people. For decades, young people from all over Finland gathered in youth centers like Kasino in Kauhajoki, where music was important, but the most important thing was to see friends. And perhaps to behave irresponsibly.

Tiina's teen-aged younger sister Juulia runs away to the Mietaa Youth Center on New Year's Eve 2003, which leads to a chain of events that brings Tiina face to face again with Mika, who performs with his band at Mietaa.