Though rated as suitable for children of all ages, the adventure is set in the 1940s and touches on mental health issues as it follows Ana, a young girl who befriends a pack of imaginary creatures elicited from the minds of patients at a psychiatric hospital. Ana’s mother who suffers from depression is one of them. Of those intangible friends, Bruno, a big-eared, green goblin-like entity, is Ana’s biggest ally in her search for her father. She must find him before a terrible procedure is practiced on her mother.