Ida is happy, at least whenever she can indulge her imagination and put her crazy ideas into practice. Newly arrived with her parents in a small town in southern Germany, Ida would actually like to make new friends, but instead she prefers to sell painted stones in her "shop of happiness", chat on her way to school with an elderly lady who is always smoking by the window or organise birthday parties for all her dolls. One day, when the most popular girls at school want to make friends with Ida, she spontaneously gets involved in the "real world" and realises that while popularity can be intoxicating, she is also increasingly losing access to her unique world. Fortunately, however, Ida's reflective mother, her creative class teacher Mrs Blum and her quirky Aunt Mathilde are there to make her feel that she shouldn't let anyone dissuade her on her personal path to happiness. And suddenly Ida has new, unique ideas again, such as opening up to a friendship without losing herself in the process or researching happiness and how best to bring it to people.