Budo is Max's imaginary friend. But though only Max can see him, he is real. He and the other imaginary friends watch over their children until the day comes that the child stops imagining them. And then they're gone. Budo has lasted a lot longer than most imaginary friends - four years - because Max needs him more. His parents argue about sending him to a special school. But Max is perfectly happy if everything is just kept the way it is, and nothing out of the ordinary happens. Unfortunately, something out of the ordinary is going to happen, and then he'll need Budo more than ever.