High-school student Suzu finds everyday social conventions difficult to deal with and is increasingly drawn into an alternative, virtual world via the U app – an Internet-based environment with five billion members. Here, she excels as singing megastar Belle; her alter-ego even providing her with a confidence boost in reality. U allows people like Suzu, who battles to cope with the loss of her mother, to find some sanctuary from the pain and struggles of their real lives.
Yet, within its atmosphere of beauty and wonder, an underlying danger surfaces. Belle/Suzu’s life becomes entwined with a disruptive presence known as the ‘Dragon’, as she recognises that behind this threatening façade someone pained is crying out for help.