Elizabeth is a young girl is under the care of her grandmother after her father is admitted to hospital. S he soon discovers a supernatural being in their apartment block and tries to track it down by following her movements. As a result of this,she connects with a neighbor by name AI who lives with supernatural beings Blue and Blossom,who she spotted in the apartment.Elizabeth finds out that the supernatural beings are referred to as Imaginary Friends and their purpose is to keep children who can see them,company and protect them.