Young Daisy turns to toy bricks as she finds herself trying to fit into a new school in a new country. When she stumbles across a mysterious key, she is transported to Heartlake City where she makes new friends. But they soon require her help to save a vital local landmark – with plenty of song and dance numbers along the way.

Set in an infected world where the children are carriers - a young orphan finds sanctuary in a ramshackle foster home but she soon discovers it's not the world outside that she should fear. It's the girls she's inside with.