"When the Lights Go Down" is a fantasy movie based on a personal experience of the film director. The film tells a story about a teen boy who is being bullied in school. A boy named Mantas creates his own guardian demon, who protects him from the bullies. Although it is not letting the boy to live a normal life. Film's timeline portrays one day at school, when the classmates of Mantas assault and beat up him badly. And here it comes, the guardian demon ready to revenge.